Key Points and Precautions for Welding Stainless Steel Air Electric Heaters
I. Preparations before welding
1. According to the product drawing requirements, use mechanical processing to remove the stainless steel composite layer at the joint, and open appropriate grooves for butt welds.
2. Clean the area within 10-20mm on both sides of the weld, using a wire brush or grinding to remove oxides, rust, oil, moisture, and other substances that affect welding quality.
3. Assemble according to the product drawing, use welding rods for tack welding on the carbon steel side. The tack welder should have a valid operation certificate to ensure the quality of tack welding. The effective length of tack welding is 25-30mm.
II. Welding process
1. Welding process for butt joints of stainless steel composite steel plates
1.1 Welding of base carbon steel
1.1.1 Use submerged arc automatic welding method. Weld one layer on the front side, then turn over and use carbon arc gouging to back gouge, then weld a sealing layer on the back side. Welding specifications are as follows:
Position Welding wire Flux Wire diameter Arc voltage Welding current Welding speed
