Processing optimization and comprehensive performance on resistance plug welding of dissimilar steel joints
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Furong Chena) and Congzeng Li School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China (Received 20 September 2016; accepted 15 May 2017)
A well-designed hybrid welding process for resistance plug welding (RPW) was conducted based on TRIP980 high-strength steel and SPCC low-carbon steel. The effects of welding current, welding duration time, electrode pressure and filler diameter on the shear tensile failure loading of the joint were systematically investigated and the related optimal welding parameters were accordingly obtained. The microstructure and mechanical properties of the joint were subsequently analyzed. The experimental results indicated that the welding parameters of welding current, filler diameter, and welding duration time and electrode pressure influencing the shear tensile failure loading of the joint are quite vital. This kind of joint possesses a rounded rectangular nugget and transition region. The atomic diffusion results in the firm joint, the metallurgical bonding between filler and base material is realized through the RPW technique.
I. INTRODUCTION
Generally, the automobile weight can be effectively reduced, and the performances of different parts will still be maintained through connections of different types of materials.1 High-strength steel has been widely used in the design of automobile parts in recent years.2 However, there are many technique difficulties when welding together high-strength steel and original material.3–5 Transformation-induced plasticity (TRIP) steel is a novel generation of high-strength steel, which has the greatest potential applied in the field of lightweight automobiles. Moreover, the TRIP high-strength steel is fabricated by increasing carbon, manganese, silicon, etc. It has poor weldability since during welding process between TRIP high-strength steel and other steels, severe segregation hardening and joint nugget interface brittle fracture occur. The superiority of TRIP steel requires that automobile manufacturers urgently solve its welding problems. Some investigations have been conducted on TRIP high-strength steel welding.6,7 The nugget diameter of the resistance spot welding joint of TRIP590 highstrength steel is an important factor to influence the joint fracture characteristics.8 The formation of brittle martensite in the heat-affected zone (HAZ) may decrease the toughness of the joint of TRIP800 high-strength steel by CO2 laser welding.9 Contributing Editor: Jürgen Eckert a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2017.215
As previously reported, the welding process and mechanical properties of the joints were investigated. The optimal welding parameters of resistance spot welding of TRIP800 high-strength steel have been obtained.10 The nugget diameter of TRIP800 high-strength pffiffiffiffi steel resistance spot welded joint should be at least 4:5 T (where T is the thickness of steel plate) so that the joint can satisfy the standard of shear tensile strength.11 Th
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