backstep welding ; backstep sequence
分段退焊次序 backstep welding sequence
分段退焊法 back-step welding ; step-back procedure
分段后退焊法 step back welding
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每条焊缝采用分段退焊法，减小焊接残余应力和变形。
Segmental back welding is adopted for each welding seam to minimize the residual stress and deformation of welding.
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