研究目的
To analyze the thermal effect of the welding sequences on residual stresses and distortion of DP600 steel joints currently used in the manufacture of welded parts of vehicles (body-in-white).
研究成果
The isotherms were narrow and elongated in both coupons, but coupon 1A was mostly affected due to longer continuous heating time. The longitudinal residual stresses were larger than the transverse stresses in both coupons. The maximum distortion measured in z-direction was 1.41 mm and 1.20 mm in coupon 1A and 1B, respectively. Thus, there was a 14.28 % decrease with the welding sequence carried out. It was possible to reduce residual stress and distortion in coupon 1B using the same heat input (140 J/mm) but with a different sequence.
研究不足
The study is limited to the simulation of laser welding sequences on DP600 steel joints and does not include experimental validation of the simulated results.
1：Experimental Design and Method Selection:
A 3D thermometallurgical and mechanical analysis was performed to predict the residual stresses and distortion induced by laser welding using the SYSWELD finite element software.
2：Sample Selection and Data Sources:
Two coupons of DP600 steel plates with butt joint preparation were analyzed. The dimensions of the plates were 200 mm x 150 mm x 2 mm thickness.
3：List of Experimental Equipment and Materials:
SYSWELD version
4：1 software was used for simulation. Experimental Procedures and Operational Workflow:
20 Two different conditions of laser welding sequences were simulated. The first condition was to perform a laser weld along the joint (200 mm), while the second condition was to perform two continuous welds to complete the length of the joint. Each weld measured half the length of the joint (100 mm).
5：Data Analysis Methods:
The thermal distribution, residual stresses and distortion were obtained in two butt joints by simulation.
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