Welding stainless steel can be tricky, but it is generally thought of as easy to achieve with the DHC 2000 Oxy/Acet Welding Torch.

To achieve a successful stainless steel weld using this torch, there are three important areas to be focused;

1) the optimum amount of heat
2) the travel speed, and
3) the setting of the flame

Stainless steel is widely used in many industries due to its inherent corrosion resistance properties.

The Basics of Stainless Steel

Stainless steel seems a poor conductor of heat. Its nickel (6%-22%) and chromium (16% to 26%) contents increase its corrosion and stain resistance. It is noted that stainless steel's heat conductivity is half the rate of mild steel, however, it has greater thermal expansion properties than mild steel when it is heated during welding.

A filler rod is recommended for base material thicker than 18 gauge, however, this will depend on the joint design. In particular, for an outside corner joint may not require a filler rod while an inside joint may require a filler rod. It is always better to select a filler rod with higher strength properties than the workpieces.

Preventing Distortion and Cracking

The stainless steel has higher thermal expansion than other metals, hence it can deform easily. It is noted that high temperature setting and slow travel speed can contribute to this problem. The stainless steel temperature rise is mainly local and when the weld cools internal stresses will develop resulting in metal deformation or buckling.

However it is interesting to note that due to the DHC 2000’s lower heat output compared to MIG or TIG, distortion levels are much less, particularly welding thin stainless steel.


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