Abstract
This research aims to study the dissimilar tailor-welded blanks between DP590 and DP980 dual phase steels using the autonomous GTAW process. The summarized results are as follows. It was found that utilized welding parameters in DP590 and DP980 steel butt joint were able to achieve complete penetration joint and there were not any defects. Furthermore, the dissimilar weld zone produced the hardness profilevalue between the DP590 and DP980 base metal. In particularly, DP590-HAZ region resulted in harden zone. Meanwhile, DP980-HAZ region induced a soften zone. By the way, the harden DP590-HAZ exhibited fine columnar martensite with a ferrite matrix. On the other hand, the soften DP980-HAZ represented a tempered martensite structures. Comparing the tensile test was carried out in order to investigate dissimilar welded joint strength in the different rolling directions. It was suggested that the specimen welded along to rolling direction was evidently larger tensile strength (1092 MPa) than the welding transverse to rolling direction (638 MPa). Moreover, the weakest fracture occurred apparently on the region of DP590-BM rather than the HAZ region.
Highlights
In recent years, automotive industry is concerned with energy saving, to reduce in the vehicle weight as a focus concern in the automobile industry
[1] In addition, Dual phase (DP) steel is widely used for fabricating automotive components such as frames, wheels, and bumpers as they offer a good combination of high strength and ductility.[2]
This paper describes the study of dissimilar tailorwelded blanks between DP590 and DP980 dual phase steels using gas tungsten arc welding process (GTAW) process
Summary
Automotive industry is concerned with energy saving, to reduce in the vehicle weight as a focus concern in the automobile industry This was the concept of Tailor-welded blanks (TWBs) has been applied to the various materials. [1] In addition, Dual phase (DP) steel is widely used for fabricating automotive components such as frames, wheels, and bumpers as they offer a good combination of high strength and ductility.[2] from the literature review a research related on the DP steels welded with other steels and the dissimilar DP steels or the similar DP steels such as [3,4,5] laser welding DP780 and DP980 high strength steel joints, Friction Stir Welding DP590 steel, resistance spot welding of DP590 steel and other researches Such works have not siginificantly reported in the combined joints between DP590 and DP980 steels. This work is beneficial for the development of future automotive technology
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