Resistance Spot Welding of High Strength Steel

Advanced high strength steel with high strength, good formability and high bake-hardening properties, energy absorption rates and higher fatigue strength, and performance advantages of Au collision, which in the automotive lightweight construction in the amount of its applications is growing , the resistance welding of high strength steel weldability studies have emerged. Current national experts on high strength steel welding resistance welding research focused on a variety of weldability of high strength steel, welding parameters on   the microstructure and properties of solder joints, welding procedures and process optimization. For example: the British connection technology TWI material global center Shi, G and other scholars to study the amendments high strength steel welding procedures and welding the base metal strength and hardening of the solder joint properties [20]; Japanese scholars Otani, Tadayuki other ultrafine Characteristics of grain made of high strength steel resistance spot welding system, has found: that the high strength steel under high temperature and low resistivity and strength of steel is different from the spot to get the same size when the size needs of the welding nugget current is greater than the low-carbon steel [21], while the carbon equivalent of this steel is very low, although the weld nugget is the martensite the main organization, but due to limited low-carbon components nugget sclerosis, and therefore such material The spot welding joints can get high without tempering tensile shear strength and vertical tensile strength [22]; French scholars Mimer, M proposed by experiments through the tempering process to improve after welding of high strength steel and ultra high strength steel the performance of resistance spot welding method [23]; Japanese scholars Sakuma, Yasuharu also the spot welding of high strength galvanized steel weldability were studied [24].
2.3 The resistance spot welding of galvanized  steel
In order to improve the corrosion resistance of products in the automotive, appliance and other industries increasingly widespread use of various types of galvanized steel, zinc plating process based on, galvanized the different components, galvanized steel sheet is divided into: Galvanized steel, thermal galvanized sheet, Zn-Ni alloy coating sheet, Zn-Fe alloy coating panels. Since the physical properties of the metal coating and conductive properties of different low-carbon steel, so the performance of resistance spot welding of galvanized steel and not galvanized steel with a quite different species, and to consider its performance, quality requirements of the joint more high, that spot when it is necessary to ensure that the joints have adequate strength, but also reasonable to protect the coating.
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Since spot welding galvanized steel in its nature there is a certain difficulty, in recent years to countries in welding workers in terms of welding galvanized steel around the welding process specification, the numerical simulation of welding process, electrode life made a lot of other issues research.
Currently, the international Welding of    galvanized steel matured, further research focused on how to improve the hot galvanized steel welding electrode life, such as using dispersion strengthened copper alloy [25] or through measures such as low temperature electrodes improve the life of the electrode [26].