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Stainless Steel

Stainless Steel Welding

Stainless steel has a higher thermal expansion characteristic (up to 50% greater) than standard mild carbon steels, which can result in more distortion, resulting in a lower current being required. Both oxygen and carbon dioxide in the shielding gas will react with stainless steel, resulting in some oxidisation, the level of oxygen or carbon dioxide that should be used therefore, should be minimised.

 

 

The range of metals falling under the category of stainless steel are wide ranging with specific applications and characteristics.  When choosing the appropriate gas, please verify compatability with your welding wire. 

 

Welding Gas Selector

Gas Weld Speed Spatter Control Porosity Control Fusion Penetration

Thickness
Range

Cost
Argon HP < 8 mm £
Argon 98/2 CO2
(solid wire)
< 8 mm £
Argon 98/2 O2 < 4 mm £
Helimix SS85 ■ ■ ■ ■ ■ ■ ■ ■ ■ > 3 mm £ £ £
Helimix SS50 ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 3 to 10 mm £ £
Helimix SS30/38 ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ > 9 mm £ £

Characteristics for MIG welding stainless steel
■ ■ ■ = Best    |    = Worst

Struggling to select a gas? If in doubt, please call 0191 271 0222 for specialist advice!

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