Welding method for ultra-thin composite layer low-carbon steel - austenitic stainless steel multiple tube adaptor

Abstract

The invention discloses a welding method for low carbon steel-austenite stainless steel compound pipe of ultra-thin stainless composite bed. The character is: the welding is completed with transition layer welding seam and base layer welding, it hasn't single stainless steel composite bed seam; the welding rod for low carbon steel base layer seam is the same to the one for mother metal; the first welding for stainless steel composite layer and the transition layer between the stainless composite layer and the low carbon steel base layer use argon tungsten-arc welding with back argon filling protection, or uses manual arc welding; the welding wire or welding rod use stainless steel in order to form the transition welding seam; after the transition welding seam is completed, the second time uses manual arc welding to weld the low carbon steel base layer, the welding rod uses low carbon steel in order to form base layer welding seam.

Description

technical field [0001] The invention relates to a welding method of stainless steel and low-carbon steel composite materials, in particular to a welding method of a low-carbon steel-austenitic stainless steel composite pipe with an ultra-thin-wall stainless steel composite layer. Background technique [0002] No similar stainless steel-carbon steel composite pipe welding method has been found through patent retrieval. In the current general stainless steel-carbon steel composite pipe, the thickness of the stainless steel composite layer is generally more than 2mm, while the thickness of the stainless steel composite layer involved in the present invention is less than 1mm, and This type of composite pipe is widely used, but the corresponding welding method has not yet been searched. Because the low-carbon steel-austenitic stainless steel composite pipe with ultra-thin-wall composite layer has certain difficulties in welding, mainly how to ensure the same corrosion resistance...

AI Technical Summary

Problems solved by technology

At present, the general composite pipe welding method is to divide the welded joint into composite layer welds, transition layer welds and base layer welds for welding separately. The welding materials of composite layer welds and transition layer welds are all stainless steel materials with different components. Production Frequent replacement of welding rods is required in the process, which is easy to make mistakes and the welding process is complicated

Images