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Abstract
The mechanical testing and microstructers for austenititc stainless steel have been carried out to indicate the effect of the localized heating on the spot welds. The results indicated that the increasing of the heating will increase the tensile shear strength rapidly up to the expulsion point. Therefore, the hardness increases with the increasing of the weld nugget area. Hence, the fracturing tendencies have been observed inside the nugget. Nevertheless, the outer surface cracking is developed by adding a thin layer of pure metals between the two stainless steel 304L sheets. It was shown that the addition of pure metals, 3-lap sheets decreases the joint strength as compared with the 2-lap joints for the same parameters. The effect of micro cracking and the intensive brittleness decreases the joint strength. The excessive cracking was observed in 3-lap as compared with the 2-lap joint.
Highlights
Resistance welding (RW) is a fusion-welding process that uses a combination of heat and pressure to produce a localized heating what called nugget weld area, see Figure 1
The heat being generated by electrical resistance to current flow at the bulk workpieces and at the interfaces due to electrical resistance (Wei & Wu, 2012) (Groover, 2007)
According to Joule law, Q = I2Rt; where Q is generated heat, I is current, R is electrical resistance of the circuit, and t is time that the current is allowed to flow through the circuit (Zhang & Senkara, 2006; Nodeh, Serajzadeh, & Kokabi, 2008; Mirsalehi & Kokabi, 2010)
Summary
Resistance welding (RW) is a fusion-welding process that uses a combination of heat and pressure to produce a localized heating what called nugget weld area, see Figure 1. The heat being generated by electrical resistance to current flow at the bulk workpieces and at the interfaces due to electrical resistance (Wei & Wu, 2012) (Groover, 2007). Resistance spot welding is effective way to join metal sheets in various manufacturing, automobile, aerospace and packaging industries Al-Shamma’A, 2007; Mukhopadhyay, Bhattacharya, & Ray, 2009; Ambroziak & Korzeniowski, 2010; Wei &. A typical car body contains thousands of spot welds for joining the mixture types of metal material and thickness of sheet (Welding, Industry, & Practice, 2002; Vural, Akkuş, & Eryürek, 2006). The process is used extensively for joining low carbon steel, stainless steels and galvanized steel components due to their wide applications as combined with the required properties(Agashe & Zhang, 2003; Pouranvari, Abedi, Marashi, &
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