Pre-weld preparation of stainless steel flanges

Pre-weld preparation of stainless steel flanges

　　1, is about to weld the stainless steel bellows and flange tube on the oil and other dirt finishing clean. If the weld is cracked and leaking, the original weld scar should be sorted out, flange tube straight pipe at grinding out the metal luster, bellows straight pipe at too thin, can not grind, grinding finishing, the use of hand emery cloth sanding bright on the line.

　　2, welding assembly: the best assembly gap is 0, because the processing and manufacturing errors are sometimes too large gaps, welding melt easy to burn through, the method of processing can be in the flange tube straight pipe to overlap local (generally 3 ~ 5mm) heap welding layer, by machine processing to 0 ~ 0.05mm gap or hand repair grinding. If the set does not go up, should turn small or grinding small flange pipe straight pipe outside diameter, until suitable.

　　3, the welding machine selection: WS315 type, the choice of DC positive connection.

　　4, welding material selection: ER308,Ø0.8mm

　　Stainless steel flange welding operation

 Stainless steel flange

　　1, welding parameters: welding current 25 ~ 30A, shielding gas flow 4 ~ 7L / min.

　　2, the starting arc must be carried out on the flange tube, the arc should refer to the thick tube, the use of the outer flame of the arc to heat the bellows and block the edge of the bellows with welding wire, with melting stainless steel wire to melt the bellows.

　　3, when welding the transport bar must be carried out on the thick tube, choose short welding seam welding or spot welding for welding.

　　4, welding to always observe the melting of the bellows, generally melting 1 to 3 molten pools at a time, should not be continuous welding, especially in the gap is large when very easy to burn through.

　　5, in summary, stainless steel bellows and stainless steel flange tube (or other tubes) arc welding decision is that the arc can not directly point to the bellows, and the arc residual heat melting bellows for welding.

　　This article is organized by the stainless steel flange, this article does not represent the views of this site.