Abstract
This article conducted a study on the process characteristics, structure, and properties of the Q890D joint. The results indicated that three-layer welding methods can obtain a joint free of pores and defects. The base metal was composed of a large amount of polygonal ferrite and dispersed granular carbides, while the weld metal consisted of lath martensite. The results also revealed that the average hardness of WM was 417.24 HV (20.7% higher than BM). The tensile performance of welded joints was better than that of BM. There were no obvious cracks on the surface of the bending specimens. Compared with BM, the impact strength and toughness of WM had been improved, since the impact toughness of HAZ was highly dispersed.
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