{"id":283961,"date":"2026-09-07T11:38:25","date_gmt":"2026-09-07T09:38:25","guid":{"rendered":"https:\/\/cjays.eu\/kenniscentrum\/algemeen\/difference-sg1-sg2-sg3-welding-wire\/"},"modified":"2026-09-07T11:38:50","modified_gmt":"2026-09-07T09:38:50","slug":"difference-sg1-sg2-sg3-welding-wire","status":"publish","type":"cjays_knowledge","link":"https:\/\/cjays.eu\/en\/kenniscentrum\/welding-wire\/difference-sg1-sg2-sg3-welding-wire\/","title":{"rendered":"What is the difference between SG1, SG2 and SG3 welding wire?"},"content":{"rendered":"<p>SG1, SG2 and SG3 are names for massive steel welding wire for MIG\/MAG welding. The terms are still widely used in workshops and commerce, although modern welding wire is nowadays usually classified according to EN ISO 14341-A.<\/p>\n<p>Globally:<\/p>\n<div class=\"ckc-table-wrap\">\n<table>\n<thead>\n<tr>\n<th>Old name<\/th>\n<th>Modern name<\/th>\n<th>Global position<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>SG1<\/td>\n<td>G2Si1 \/ 2Si<\/td>\n<td>Low alloy<\/td>\n<\/tr>\n<tr>\n<td>SG2<\/td>\n<td>G3Si1 \/ 3Si1<\/td>\n<td>Most widely used universal steel welding wire<\/td>\n<\/tr>\n<tr>\n<td>SG3<\/td>\n<td>G4Si1 \/ 4Si1<\/td>\n<td>Higher Mn\/Si content and higher strength class possible<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>The main difference lies in the chemical composition, in particular the content of manganese and silicon, and the resulting mechanical properties of the weld metal.<\/p>\n<h2>What does SG mean?<\/h2>\n<p>SG is a historical German designation for solid welding wire for gas-shielded arc welding.<\/p>\n<p>Although modern standards use different codes, the names SG1, SG2 and SG3 have never really disappeared in practice.<\/p>\n<p>As a result, you often hear in workshops:<\/p>\n<ul>\n<li>Take a roll of SG2.<\/li>\n<li>This machine is on SG3.<\/li>\n<li>Do you have 1.0 mm SG2 in stock?<\/li>\n<\/ul>\n<p>While the modern label can contain for example G3Si1.<\/p>\n<h2>What is the modern name for SG1, SG2 and SG3?<\/h2>\n<p>The modern European classification uses codes from EN ISO 14341-A.<\/p>\n<div class=\"ckc-table-wrap\">\n<table>\n<thead>\n<tr>\n<th>Historical name<\/th>\n<th>Common modern agreement<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>SG1<\/td>\n<td>G2Si1 \/ 2Si<\/td>\n<\/tr>\n<tr>\n<td>SG2<\/td>\n<td>G3Si1 \/ 3Si1<\/td>\n<\/tr>\n<tr>\n<td>SG3<\/td>\n<td>G4Si1 \/ 4Si1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>For example, B\u00f6hler Welding lists solid steel wires with classifications 2Si, 3Si1 and 4Si1 within EN ISO 14341-A.<\/p>\n<h2>What is SG1 welding wire?<\/h2>\n<p>SG1 is the lighter, lower alloy steel welding wire within this traditional range.<\/p>\n<p>The modern agreement is roughly around G2Si1 \/ 2Si.<\/p>\n<p>This wire contains less silicon and manganese than SG2 and SG3.<\/p>\n<p>SG1 is less common nowadays in general structural fabrication than SG2.<\/p>\n<h2>What is SG1 used for?<\/h2>\n<p>SG1 can be used for non-alloy and certain low-alloy steels where the required mechanical properties and welding procedure are appropriate.<\/p>\n<p>It is not a wire that you simply choose because it is a lighter. The choice should be tailored to:<\/p>\n<ul>\n<li>base material<\/li>\n<li>Material thickness<\/li>\n<li>Construction standard<\/li>\n<li>Tensile strength required<\/li>\n<li>Spherical stroke values<\/li>\n<li>WPS<\/li>\n<li>shielding gas<\/li>\n<\/ul>\n<h2>What is SG2 welding wire?<\/h2>\n<p>SG2 is by far the best known and most widely used general MIG\/MAG-welding wire for structural steel.<\/p>\n<p>The modern agreement is usually G3Si1 \/ 3Si1.<\/p>\n<p>B\u00f6hler Welding carries multiple massive steel wires with EN ISO classification 3Si1, including products for general structural fabrication.<\/p>\n<h2>Why is SG2 used so much?<\/h2>\n<p>SG2 offers a good balance between:<\/p>\n<ul>\n<li>Loadability<\/li>\n<li>Mechanical properties<\/li>\n<li>arc characteristics<\/li>\n<li>Availability<\/li>\n<li>Price<\/li>\n<li>Applicability to general structural steel<\/li>\n<\/ul>\n<p>Therefore, SG2 is often the standard choice for steel construction, engineering, repair and general workshop use.<\/p>\n<h2>What is SG2 used for?<\/h2>\n<ul>\n<li>Construction steel<\/li>\n<li>Mechanical engineering<\/li>\n<li>Repair<\/li>\n<li>Steel industry<\/li>\n<li>sheet metal work<\/li>\n<li>Agricultural machinery<\/li>\n<li>Vehicle construction<\/li>\n<li>General MAG applications<\/li>\n<\/ul>\n<p>For common S235 and S355 applications, a suitable SG2\/G3Si1 welding wire is widely used, provided the chosen wire meets the required standard and WPS.<\/p>\n<h2>What is SG3 welding wire?<\/h2>\n<p>SG3 is a higher alloyed solid steel welding wire within this traditional family.<\/p>\n<p>The modern agreement is usually G4Si1 \/ 4Si1.<\/p>\n<p>Compared to SG2, SG3 usually contains more manganese and silicon.<\/p>\n<h2>What does more manganese and silicon do?<\/h2>\n<p>manganese and silicon play different roles in the weld metal.<\/p>\n<p>They influence, among other things:<\/p>\n<ul>\n<li>Deoxidation<\/li>\n<li>Strength of weld metal<\/li>\n<li>Liquid behaviour of the weld pool<\/li>\n<li>Mechanical properties<\/li>\n<li>Composition of the final weld metal<\/li>\n<\/ul>\n<p>However, more Mn and Si does not automatically mean that the wire is better for every application.<\/p>\n<h2>Is SG3 stronger than SG2?<\/h2>\n<p>In many product ranges, a 4Si1 welding wire is classified in a higher strength class than a similar 3Si1 welding wire.<\/p>\n<p>For example, B\u00f6hler mentions 3Si1 products with classifications around G 42 and 4Si1 products around G 46, depending on the specific product and shielding gas.<\/p>\n<p>Therefore, SG3 may be attractive when a higher strength of the weld metal is required.<\/p>\n<p>Always check the exact datasheet for that.<\/p>\n<h2>Does G42 or G46 mean the same as tensile strength?<\/h2>\n<p>Not directly.<\/p>\n<p>The classification within EN ISO 14341 contains several components and refers, among other things, to strength class, shearing behaviour, shielding gas and chemical composition.<\/p>\n<p>Therefore, read the complete classification and not just one number.<\/p>\n<h2>Is SG3 better than SG2?<\/h2>\n<p>No.<\/p>\n<p>SG3 is not simply a better SG2.<\/p>\n<p>It is another wire with a different chemical composition and other potential mechanical properties.<\/p>\n<p>If SG2 meets all requirements, SG3 may be unnecessary.<\/p>\n<h2>When to choose SG3?<\/h2>\n<p>SG3 may be interesting when:<\/p>\n<ul>\n<li>A higher strength class is required<\/li>\n<li>The base material required<\/li>\n<li>An WPS specifically prescribes G4Si1<\/li>\n<li>Construction standards or customer conditions require this<\/li>\n<li>The mechanical properties of SG2 are insufficient<\/li>\n<\/ul>\n<p>The choice must therefore be technically justified.<\/p>\n<h2>Is SG3 intended for dirty or rusty steel?<\/h2>\n<p>That is sometimes said too simply.<\/p>\n<p>The higher content of silicon and manganese affects the deoxidation of the weld pool, but that does not mean that SG3 is a solution for poorly prepared material.<\/p>\n<p>For good welding, steel surfaces shall still be as free as possible from:<\/p>\n<ul>\n<li>Oil<\/li>\n<li>Fat<\/li>\n<li>Paint<\/li>\n<li>Fluid<\/li>\n<li>Heavy rust<\/li>\n<li>Dirty<\/li>\n<\/ul>\n<p>Another welding wire does not replace good welding preparation.<\/p>\n<h2>What&#x27;s the difference in chemical composition?<\/h2>\n<p>Exact values vary by manufacturer and product.<\/p>\n<p>Globally, the manganese and silicon content rises from SG1 to SG3.<\/p>\n<div class=\"ckc-table-wrap\">\n<table>\n<thead>\n<tr>\n<th>Type<\/th>\n<th>manganese \/ silicon<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>SG1<\/td>\n<td>Relatively Low<\/td>\n<\/tr>\n<tr>\n<td>SG2<\/td>\n<td>Medium<\/td>\n<\/tr>\n<tr>\n<td>SG3<\/td>\n<td>Relatively high<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Always use the material certificate or product datasheet of the respective roll for exact percentages.<\/p>\n<h2>Why is silicon in steel welding wire?<\/h2>\n<p>Silicon works as a deoxidant, among other things.<\/p>\n<p>During welding, oxygen can enter the weld pool. Silicon binds part of it and consequently helps to form a manageable weld metal.<\/p>\n<p>Silicon also influences the flow behaviour of the weld pool.<\/p>\n<h2>Why is manganese in steel welding wire?<\/h2>\n<p>manganese contributes, among other things, to:<\/p>\n<ul>\n<li>Deoxidation<\/li>\n<li>Mechanical properties<\/li>\n<li>Strength<\/li>\n<li>Metallurgical control of the weld metal<\/li>\n<\/ul>\n<p>The exact effect is related to the complete chemical composition and the base material.<\/p>\n<h2>Which wire is most commonly used?<\/h2>\n<p>For general steel work, SG2 \/ G3Si1 is usually the most commonly used choice.<\/p>\n<p>This is the wire that you will find on an MIG\/MAG machine in many professional workshops by default.<\/p>\n<h2>Which wire do you use for S235?<\/h2>\n<p>For many normal S235 applications, a suitable SG2\/G3Si1 is used.<\/p>\n<p>But when the construction is welded according to a specific standard or WPS, that documentation is leading.<\/p>\n<h2>Which wire do you use for S355?<\/h2>\n<p>Also for many S355 applications, a suitable G3Si1\/SG2-wire is common.<\/p>\n<p>With higher requirements for strength, toughness or specific material combinations, an G4Si1\/SG3 or other welding wire can be prescribed.<\/p>\n<h2>Can I use SG3 where normal SG2 is used?<\/h2>\n<p>Technically that may be possible in some situations, but you should not change filler metal randomly.<\/p>\n<p>In the case of certified work, it shall be verified that:<\/p>\n<ul>\n<li>The WPS allows<\/li>\n<li>The strength class fits<\/li>\n<li>The chemical composition is suitable<\/li>\n<li>The required stroke value is reached<\/li>\n<li>The base material is compatible<\/li>\n<\/ul>\n<h2>Can I use SG2 instead of SG3?<\/h2>\n<p>That too depends on the requirements.<\/p>\n<p>When a construction or WPS prescribes a higher class, going back to SG2\/G3Si1 may mean that the required mechanical properties are no longer guaranteed.<\/p>\n<h2>Is SG2 the same as ER70S-6?<\/h2>\n<p>Not exactly.<\/p>\n<p>SG2\/G3Si1 is a European classification tradition, while ER70S-6 comes from the American AWS system.<\/p>\n<p>There is a lot of overlap in applications and chemical composition, but the systems are not one-on-one the same.<\/p>\n<p>This is also demonstrated by manufacturer data: B\u00f6hler mentions both 3Si1 and 4Si1 products under AWS ER70S-6.<\/p>\n<h2>Is SG3 the same as ER70S-6?<\/h2>\n<p>This cannot be said universally either.<\/p>\n<p>Some G4Si1 products also carry an ER70S-6 classification, while the European EN ISO classification uses a different chemical and mechanical classification.<\/p>\n<p>Therefore, use the full product classification.<\/p>\n<h2>Which shielding gas do you use with SG1, SG2 and SG3?<\/h2>\n<p>These steel wires are usually used with an argon\/CO2 blend gas at MAG welding.<\/p>\n<p>For example, commonly used mixtures are:<\/p>\n<ul>\n<li>80\/20 Ar\/ CO2<\/li>\n<li>82\/18 Ar\/ CO2<\/li>\n<li>85\/15 Ar\/ CO2<\/li>\n<\/ul>\n<p>Also 100% CO2 may be possible depending on the wire classification and application.<\/p>\n<p>Always check the datasheet, as mechanical classifications may vary per shielding gas.<\/p>\n<h2>Does the shielding gas affect the classification?<\/h2>\n<p>Yes.<\/p>\n<p>For example, in EN ISO classifications you see indications such as:<\/p>\n<ul>\n<li>M21<\/li>\n<li>C1<\/li>\n<\/ul>\n<p>For certain 3Si1 and 4Si1 welding wire he gives different classifications for mixed gas and for 100% CO2.<\/p>\n<h2>Is SG1, SG2 or SG3 suitable for MIG welding?<\/h2>\n<p>For steel with an active gas we speak technically of MAG welding, not MIG.<\/p>\n<p>In daily practice it is often simply said to be &quot;MIG-wire&quot; but SG1, SG2 and SG3 are usually used as MAG-wire for steel.<\/p>\n<h2>Which diameters are available?<\/h2>\n<p>That depends on manufacturer and product line.<\/p>\n<p>Common diameters are:<\/p>\n<ul>\n<li>0,6 mm<\/li>\n<li>0,8 mm<\/li>\n<li>1.0 mm<\/li>\n<li>1.2 mm<\/li>\n<li>1.6 mm<\/li>\n<\/ul>\n<p>For general work, 0.8, 1.0 and 1.2 mm are very common.<\/p>\n<h2>Which wire size do you choose?<\/h2>\n<div class=\"ckc-table-wrap\">\n<table>\n<thead>\n<tr>\n<th>Application<\/th>\n<th>Highly used wire size<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Dun sheet metal work<\/td>\n<td>0.6 \/ 0.8 mm<\/td>\n<\/tr>\n<tr>\n<td>General work<\/td>\n<td>0.8 \/ 1.0 mm<\/td>\n<\/tr>\n<tr>\n<td>Construction<\/td>\n<td>1.0 \/ 1.2 mm<\/td>\n<\/tr>\n<tr>\n<td>Heavy production<\/td>\n<td>1.2 \/ 1.6 mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>These are global guidelines. Machine power, position, plate thickness and desired deposition rate also play along.<\/p>\n<h2>Is copper-coated SG2 different from uncoated wire?<\/h2>\n<p>Yes.<\/p>\n<p>The SG or G3Si1 classification does not automatically tell whether the wire is copper coated.<\/p>\n<p>There are both:<\/p>\n<ul>\n<li>Copper coated solid wire<\/li>\n<li>Non-copper coated solid wire<\/li>\n<\/ul>\n<p>For example, he performs several non-coppered ECOspark-wires alongside conventional solid steel wires.<\/p>\n<h2>Is non-copper coated wire better?<\/h2>\n<p>Not automatically.<\/p>\n<p>It&#x27;s a different product version. The quality depends on:<\/p>\n<ul>\n<li>Surface quality<\/li>\n<li>Wire tolerance<\/li>\n<li>Contact transfer<\/li>\n<li>wire feed<\/li>\n<li>Storage<\/li>\n<li>Manufacturer<\/li>\n<\/ul>\n<p>Choose based on process, machine and product quality.<\/p>\n<h2>Can I use SG2 from different brands?<\/h2>\n<p>For ordinary work, products with the same relevant classification may be comparable, but they are not automatically identical.<\/p>\n<p>Check:<\/p>\n<ul>\n<li>EN ISO Classification<\/li>\n<li>Chemical analysis<\/li>\n<li>Mechanical properties<\/li>\n<li>Diameter<\/li>\n<li>Surface treatment<\/li>\n<li>Certificate<\/li>\n<li>Approvals<\/li>\n<\/ul>\n<h2>Why can one SG2 weld differently than the other?<\/h2>\n<p>Even when two reels are sold both as G3Si1, small differences may exist in:<\/p>\n<ul>\n<li>Wire area<\/li>\n<li>Tolerance<\/li>\n<li>Copper layer<\/li>\n<li>Chemical composition within standard<\/li>\n<li>Rinse quality<\/li>\n<li>wire feed behaviour<\/li>\n<\/ul>\n<p>Therefore, arc characteristics and spatter may differ slightly in practice.<\/p>\n<h2>Which wire should I buy for general steel work?<\/h2>\n<p>For general MAG welding of structural steel, SG2 \/ G3Si1 is usually the logical starting point.<\/p>\n<p>Choose SG3\/G4Si1 when required mechanical properties, WPS or application give rise to this.<\/p>\n<p>SG1\/G2Si1 is now a less common general choice.<\/p>\n<h2>When should you not just choose SG2?<\/h2>\n<p>For critical or certified constructions.<\/p>\n<p>Remember:<\/p>\n<ul>\n<li>High strength steel<\/li>\n<li>Pressure vessels<\/li>\n<li>Crane construction<\/li>\n<li>Bridge construction<\/li>\n<li>Specific offshore applications<\/li>\n<li>Certified structural fabrication<\/li>\n<li>Work with prescribed WPS<\/li>\n<\/ul>\n<p>There the filler metal must be consciously connected to the base material and the welding procedure.<\/p>\n<h2>SG1, SG2 and SG3 in one overview<\/h2>\n<div class=\"ckc-table-wrap\">\n<table>\n<thead>\n<tr>\n<th>Property<\/th>\n<th>SG1<\/th>\n<th>SG2<\/th>\n<th>SG3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Modern Agreement<\/td>\n<td>G2Si1 \/ 2Si<\/td>\n<td>G3Si1 \/ 3Si1<\/td>\n<td>G4Si1 \/ 4Si1<\/td>\n<\/tr>\n<tr>\n<td>Mn\/Si content<\/td>\n<td>Lower<\/td>\n<td>Medium<\/td>\n<td>Higher<\/td>\n<\/tr>\n<tr>\n<td>General application<\/td>\n<td>Less common<\/td>\n<td>Very common<\/td>\n<td>More specific<\/td>\n<\/tr>\n<tr>\n<td>General construction steel<\/td>\n<td>Possible<\/td>\n<td>Very common<\/td>\n<td>Possible<\/td>\n<\/tr>\n<tr>\n<td>Higher strength class<\/td>\n<td>Less<\/td>\n<td>Normal<\/td>\n<td>More often<\/td>\n<\/tr>\n<tr>\n<td>Availability<\/td>\n<td>Less common<\/td>\n<td>Very large<\/td>\n<td>Good<\/td>\n<\/tr>\n<tr>\n<td>Standard workshop choice<\/td>\n<td>Less common<\/td>\n<td>Yes<\/td>\n<td>Only if necessary<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>Is SG3 more expensive than SG2?<\/h2>\n<p>That is possible, but the price difference depends on brand, packaging, diameter and supplier.<\/p>\n<p>Price only is not a good reason to choose between SG2 and SG3.<\/p>\n<p>The technical requirements of the welded joint are more important.<\/p>\n<h2>From Cjays practice<\/h2>\n<p>For the vast majority of normal structural fabrication we come out on SG2 \/ G3Si1.<\/p>\n<p>That&#x27;s not because SG3 is worse, but because SG2 does exactly what is needed for many standard steel applications.<\/p>\n<p>SG3 becomes interesting when the application deliberately requires a higher mechanical class or other composition.<\/p>\n<p>We would therefore not recommend:<\/p>\n<p>Oh, yeah, yeah.<\/p>\n<p>The better question is:<\/p>\n<p>Which wire belongs to my base material and the required welding properties?<\/p>\n<p>In normal work you can usually look at:<\/p>\n<ul>\n<li>base material<\/li>\n<li>Sheet thickness<\/li>\n<li>shielding gas<\/li>\n<li>wire diameter<\/li>\n<li>Machine power<\/li>\n<li>Required strength<\/li>\n<\/ul>\n<p>For certified work, the WPS and material standard are included.<\/p>\n<h2>Step plan to choose the right steel welding wire<\/h2>\n<ul>\n<li>Determine which steel you are burdening.<\/li>\n<li>Check the required mechanical properties.<\/li>\n<li>Check if an WPS is present.<\/li>\n<li>Choose the appropriate EN ISO classification.<\/li>\n<li>Choose the shielding gas.<\/li>\n<li>Determine the wire diameter.<\/li>\n<li>Check any labels and certificates.<\/li>\n<li>Then choose the brand and packaging.<\/li>\n<\/ul>\n<h2>The main conclusion<\/h2>\n<p>SG1, SG2 and SG3 are historical names for different classes of massive steel welding wire.<\/p>\n<p>Globally:<\/p>\n<ul>\n<li>SG1 \u2248 G2Si1 \/ 2Si<\/li>\n<li>SG2 \u2248 G3Si1 \/ 3Si1<\/li>\n<li>SG3 \u2248 G4Si1 \/ 4Si1<\/li>\n<\/ul>\n<p>SG2 is the most commonly used general steel welding wire.<\/p>\n<p>SG3 generally contains more manganese and silicon and can therefore fall into higher mechanical strength classes.<\/p>\n<p>However, SG3 is not automatically better. Choose the wire based on base material, standard, WPS and required mechanical properties.<\/p>\n<h2>Further reading<\/h2>\n<ul>\n<li><a href=\"\/en\/kenniscentrum\/buying-advice\/which-mig-mag-welding-torch-do-i-need\/\">How do you determine which MIG\/MAG welding torch you need?<\/a><\/li>\n<li><a href=\"\/en\/kenniscentrum\/mig-mag-welding\/what-is-pulse-mig-mag-welding\/\">What is Pulse MIG\/MAG welding and when should you use it?<\/a><\/li>\n<li><a href=\"\/en\/kenniscentrum\/brands\/certilas-ceweld-brand\/what-kind-of-brand-is-ceweld-certilas\/\">What kind of brand is CEWELD \/ Certilas?<\/a><\/li>\n<\/ul>\n<h2>Frequently Asked Questions about SG1, SG2 and SG3<\/h2>\n<h3>Which one&#x27;s the most commonly used?<\/h3>\n<p>SG2, now commonly referred to as G3Si1, is the most commonly used general steel welding wire.<\/p>\n<h3>Is SG2 the same as G3Si1?<\/h3>\n<p>In practice, SG2 is usually linked to G3Si1. The exact classification on the datasheet remains guiding.<\/p>\n<h3>Is SG3 the same as G4Si1?<\/h3>\n<p>Yes, SG3 is now roughly linked to G4Si1.<\/p>\n<h3>Is SG3 stronger than SG2?<\/h3>\n<p>Many G4Si1 products fall into a higher strength class than similar G3Si1 products, but always check the exact product datasheet.<\/p>\n<h3>Can I use SG3 for normal steel?<\/h3>\n<p>That can be dependent on application, but it is not automatically necessary or better than SG2.<\/p>\n<h3>Which wire do I use for S235?<\/h3>\n<p>For many normal applications, SG2\/G3Si1 is a common choice.<\/p>\n<h3>Which wire do I use for S355?<\/h3>\n<p>S355 applications are also used for many G3Si1 applications. With higher requirements, G4Si1 or any other wire may be required.<\/p>\n<h3>Is SG2 the same as ER70S-6?<\/h3>\n<p>Not exactly. They are classifications from different standard systems and the overlap is not one-to-one.<\/p>\n<h3>What gas do you use with SG2?<\/h3>\n<p>Usually an argon\/CO2 mixture gas such as 82\/18 or 80\/20. Depending on wire and classification, 100% CO2 may also be possible.<\/p>\n<h3>Is SG3 better for rusty steel?<\/h3>\n<p>No. More manganese and silicon do not replace good material preparation. Remove heavy rust, paint, oil and dirt before welding.<\/p>\n<h2>Choose SG1, SG2 or SG3 welding wire?<\/h2>\n<p>For normal steelwork, SG2\/G3Si1 is usually the most practical choice. With higher mechanical requirements or prescribed welding procedures, SG3\/G4Si1 or any other wire may be necessary.<\/p>\n<p>Cjays Lastechniek can help to choose the right welding wire, wire diameter and the right shielding gas for your MIG\/MAG application.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn the differences between SG1, SG2 and SG3 steel welding wire, their modern EN ISO classifications, composition, mechanical properties and applications.<\/p>\n","protected":false},"author":3,"featured_media":0,"template":"","meta":{"footnotes":""},"cjays_knowledge_cat":[4388],"class_list":["post-283961","cjays_knowledge","type-cjays_knowledge","status-publish","hentry","cjays_knowledge_cat-welding-wire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SG1, SG2 or SG3 welding wire? 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