How should flange manufacturers weld? I will take the stainless steel flange as an example to introduce to you.

Stainless steel flanges are widely used in oil, water and gas pipelines, and most of them are under certain pressure. This thin bellows is generally welded because it is too thin (about 0.2 mm) and difficult to weld. Welding methods include soldering, brazing, etc.

I. Preparation before welding

1. Remove oil and other dirt from the stainless steel corrugated flange. Assuming welding cracks and leaks, the original welding scars should be removed, the flange pipe straight pipe should be polished metallic luster, corrugated pipe straight pipe is too thin to grind, grind and clean, bright application of hand craft sand cloth polishing.

2. welding assembly:*** equipment open space for 0, because the processing error is sometimes too large, welding simple burn through, fusion processing program can be stacked in the flange pipe straight pipe (generally 3 ~ 5Mm) stacking layer, processing for 0. ~ 0.05 mm open space or manual grinding. If the casing is not suitable, rotate or straighten the outer diameter of the small flange tube until it is suitable for stopping.

Second, how to weld stainless steel flange

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

2. arc is necessary to advance in the flange pipe. Arc refers to the thick pipe, the choice of arc flame heating bellows, plugging the edge of the bellows with welding wire, melting stainless steel wire melting bellows.

3. should be welded thick-walled pipe, choose short welding or spot welding.

4. During the welding process, the melting conditions of the bellows should be asked at any time. Generally speaking, one or three melt pools should be melted at a time, so it is not advisable to join one welding at a time. Especially in the case of a large open space, it is simple to burn through.

5. In short, the arc welding process of stainless steel flange (or other pipes) means that the arc cannot be directed to the bellows, but the arc hot melt welding on the bellows.

The above is a summary of the stainless steel flange welding process, we hope it can help us.