Process research on 12.5 mm thick low alloy high strength TATM700 girder steel for automobile structural parts was studied by plasma-MIG hybrid welding equipment. The weld formation, weld microstructure and mechanical properties under different groove forms were analyzed. Furthermore, it compared with the multi-layer manual TIG method of flux cored wire. The results showed that the groove form has less influence on the plasma-MIG composite welding seam. The sample welded by the composite welding method is well formed and the cross-sectional shape is reasonable. The weld structure consists of a small amount of side slab ferrite and a large number of acicular ferrite. The joint strength and bending performance are better than manual TIG welding, the tensile strength reaches 95% of the base metal, and the hardness is slightly lower than the multi-layer multi-channel hand-welded TIG welding sample.
ZHANG Hongtao
,
SANG Jian
,
WANG Qichen
,
TENG Yao
,
ZHANG Wenjie
. Research on plasma-MIG hybrid welding process of TATM700 steel[J]. Transactions of The China Welding Institution, 2019
, 40(12)
: 25
-30
.
DOI: 10.12073/j.hjxb.2019400307
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