Submerged-arc welding process of stainless steel plate larger than 80mm in thickness

Abstract

The invention discloses a submerged-arc welding process of a stainless steel plate larger than 80mm in thickness. The submerged-arc welding process comprises the following steps: beveling the steel plate, wherein symmetrical double U-shaped bevels are adopted, the angle of each bevel is 45 to 55 degrees, the truncated edge is 3mm to 5mm in thickness, and the clearance of the truncated edge is 2mm to 3mm; cleaning up the bevel of a weldment, 20-mm area in each side of the bevel and the surface of a to-be-welded position; selecting a welding wire which is 3mm to 4mm in diameter and is made from the same material of the weldment; baking a solder for 1 to 2 hours at the temperature of 300 to 400 DEG C before welding; during welding, performing bottom welding on the front surface of a metal plate by adopting gas shielded welding, subsequently filling a welding bead by adopting submerged-arc welding, turning over after filling the welding bead, removing the previous gas shielded welding bead from the reverse surface by adopting carbon arc gouging, exposing a submerged-arc welding bead in the front surface and then performing submerged-arc welding until the welding bead is filled. The welding process disclosed by the invention is simple and good in formation of the welding line; the obtained welded joint is good in quality and free of welding cracks and welding deformation.

Description

technical field [0001] The invention relates to a welding process, in particular to a submerged arc welding process for stainless steel plates with a thickness of more than 80 mm. Background technique [0002] The steel plates used in people's daily life are generally of small and medium thickness, but in some special areas and special fields, it is necessary to use large-thickness steel, such as offshore oil production platforms, which play a role in supporting all equipment and derricks in the development of oil and gas field projects. It is a large component that is continuously under heavy pressure, and its importance is self-evident. At the same time, the working conditions of offshore oil production platforms are also very harsh. The service time spans four seasons, and the temperature difference in the working environment varies greatly. In winter, it must withstand the test of low temperature. With the improvement of steel strength, the requirements for welding qual...

AI Technical Summary

Problems solved by technology

The greater the thickness of the steel plate, the greater the sensitivity to welding cold cracks, and the greater the sensitivity to post-weld delayed cracks

It is difficult to ensure the quality and performance of welded joints in welding practice, such as the low strength of welded joints, which cannot meet the requirements of the current industry