Welding Stainless Steel Process

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Welding Stainless Steel Process

2022-06-22

1. Why is it difficult to weld stainless steel?

Answer: The main process difficulty is:

<1> The stainless steel material has strong thermal sensitivity, and the residence time is slightly longer in the temperature range of 450--850 °C, and the corrosion resistance of the weld and heat-affected zone is seriously reduced.

<2> Thermal cracks are prone to occur.

<3> Poor protection and serious high temperature oxidation.

<4> The linear expansion coefficient is large, resulting in large welding deformation.

2. Why should effective technological measures be taken for welding austenitic stainless steel?

Answer: The general process measures are:

<1> Welding materials should be strictly selected according to the chemical composition of the base metal.

<2> Small current., fast welding; small line energy, reduce heat input.

<3> Thin-diameter welding wire, electrode, no swing, multi-layer multi-pass welding.

<4> Forced cooling of the weld and heat affected zone to reduce the residence time at 450-850°C.

<5> Argon gas protection on the back of TIG weld.

<6> The welds in contact with the corrosive medium are welded last.

<7> Passivation treatment of welds and heat-affected zone.

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