A method and system for low stress overlay welding outside of a pipe
By applying a magnetic field to the welding torch to cause the arc to oscillate at high frequency and combining it with the dynamic control of the partitioned cooling module, the problems of concentrated heat input and crude cooling methods in traditional arc welding are solved. This achieves low-stress welding, reduces thermal deformation and residual stress, and improves the quality and process adaptability of the weld layer.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HANGZHOU HANGGUO INDUSTRIAL BOILER CO LTD
- Filing Date
- 2026-05-28
- Publication Date
- 2026-07-17
AI Technical Summary
Traditional electric arc welding methods result in large thermal deformation and high residual stress in pipelines, and existing improvement schemes have failed to effectively solve the problems of heat input distribution and cooling methods.
A magnetic field is applied to the welding torch to cause the electric arc to oscillate at high frequency. Combined with axially distributed partitioned cooling modules, closed-loop control is achieved through real-time temperature monitoring, enabling dynamic adjustment of arc energy dispersion and local cooling.
It significantly reduces pipeline thermal deformation, converts residual tensile stress into compressive stress, improves the quality of weld overlay, reduces the amount of cooling medium used, and enhances process stability and adaptability.
Smart Images
Figure CN122400718A_ABST