Assembly and welding operations of stainless steel flanges

When stainless steel flange pipe fittings are welded, carbides are precipitated after repeated heating, which reduces corrosion resistance and mechanical properties. The stainless steel flange pipe has a metallic luster on the straight pipe, and the rippling pipe is too thin to be ground, polished and cleaned. Just use a hand emery cloth to polish it. Welding assembly: Due to processing errors, sometimes the gap is too large, and it is easy to burn through during welding. The disposal method may overlap the local (3～5mm) surfacing layer on the stainless steel flange pipe, and the machining to 0 ~0.05mm gap or craft grinding. If it does not fit, the outer diameter of the straight flange pipe should be reduced by car or grinding until it is suitable. Welding operation of stainless steel threaded flange Th stainless steel flange 1. Welding parameters: welding current 25～30A, maintenance air flow 4～7L/min. 2. The arc starting must be carried out on the flange pipe length. The arc should be on the thick pipe. The outer flame of the arc is used to heat the rippling pipe, and the edge of the rippling pipe is blocked with the welding wire, and the molten stainless steel welding wire is used to melt the rippling pipe. 3. The welding time must be carried out on the thick pipe length, and short weld seam welding or spot welding should be used for welding. 4. When welding, it is necessary to observe the melting situation of the ripple tube at all times. Individually melt 1 to 3 molten pools at a time. Continuous welding is not suitable, especially when the gap is large, it is easy to burn through.