What are the pre welding preparations for stainless steel flanges

　　1. Clean up the oil and other dirt on the stainless steel corrugated pipes and flange pipes that are about to be welded. If the leakage is caused by cracking at the welding joint, the original welding scar should be removed, and the straight pipe of the flange pipe should be polished with a metallic luster. The straight pipe of the corrugated pipe is too thin to be ground or polished. Use a hand sandcloth to polish it.

　　2. Welding assembly: The optimal assembly gap is 0, because there are processing and manufacturing errors with large time and space gaps, which can easily burn through during welding. The treatment method can be to overlay a layer (usually 3-5mm) on the straight pipe of the flange pipe, and machine it to a gap of 0-0.05mm or polish it with craftsmanship. If it cannot be fitted, the outer diameter of the flange pipe should be reduced or ground until it is suitable.

　　3. Welding machine selection: WS315 type, with DC positive connection.

　　4. Welding material selection: ER308, Ø 0.8mm