Development of LTTW consumables for the enhancement of mechanical properties and residual stress management in thin steel welded joints
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For automotive industry, distortion introduced by welding of the thin sheet metals could be problematic in the assembly of auto-body. In addition, fatigue life of the lap-joint panels using advanced high strength steels (AHSS) is typically limited by the weldments. Low transformation temperature welding (LTTW) consumables are characterized by low martensite start temperature and large fraction of martensite forming in the weld. It can efficiently reduce the tensile residual stress because the volume expansion associated with the martensitic transformation compensates for the thermal contraction ...