It depends on the actual situation
2 mm thick stainless steel pipe butt weld, generally do not leave a gap, stainless steel pipe welding, which should be argon, 2 mm stainless steel pipe due to its plate thickness is relatively thin, in the welding time generally do not need to leave a gap, direct welding one-time single-side welding double-sided forming. Argon arc welding is deep enough to penetrate the reverse side, so two millimeters of stainless steel tube, no gap.
Generally 3MM stainless steel bilateral gap 30 (0.3mm) is the best gap. I'm in the mold business.
That's right! According to the different hardness of stainless steel, the gap between the Punch and Die can be selected in two ways. 0.15mm\/ unilateral and 0.19mm\/ unilateral. The cut of stainless steel with high hardness will be uneven. There's a formula on the Internet. Just do the math. Clearance 0.5MM