Description of electric welding connection process for stainless steel joints
1. Application background For small diameter (<DN500) plastic-coated steel pipes and pipe fittings, due to the small pipe diameter, the internal coating damage caused by electric welding construction during connection cannot be repaired, so that the conveying medium is in direct contact with the steel pipe or pipe fittings, and the entire plastic-coated anticorrosive pipeline Lose the effect of plastic coating. In response to this situation, combined with the corrosion resistance of the stainless steel material itself, the design and development of stainless steel
The joint electric welding connection method solves the problem that the inner joint of the small-diameter plastic-coated pipe is difficult to repair. Let’s take a look at how the information technology of stainless steel joint electric welding connection can realize the connection.
2. Connection principle≧DN200 steel pipe or pipe fitting port lining L=100mm, δ=1.2mm stainless steel joint, <DN200 steel pipe or pipe fitting port lining L=60mm, δ=1.2mm stainless steel joint, joint outer wall and steel pipe or pipe fitting The inner wall of the tube is tightly attached, and the joint port is 1~2mm beyond the steel pipe or pipe fitting port. The stainless steel joint is welded to the pipe wall by argon arc welding both inside and outside, and the outer end bead is flush with the steel pipe port after welding. Made well
The stainless steel joint steel pipes or pipe fittings are sandblasted, rust-removed, and heated. When coating, 40mm is reserved on the outside of the stainless steel joints, and the remaining parts are covered with an inner coating, so that the inner coating is evenly covered on the steel pipes or pipe fittings and the stainless steel joints, becoming a continuous coating. When connecting on-site, the two stainless steel joint pipe sections are butt-joined, and the argon tungsten arc welding is used for bottom welding. The stainless steel joint is firmly and tightly welded as a whole, and then the two pipe sections are manually welded.
Arc welding connection. This connection method avoids the filling operation of the internal joints, ensures that the conveying medium does not directly contact the steel pipe or pipe fittings, and makes the anti-corrosion layer and the corrosion resistance of the stainless steel play a role.