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In this paper, the effects of the electrode type on microstructure and hardness of the resistance spot welded junctions of DP steel were studied. Commercial galvanized DP sheet steel was used. Resistance spot welding (RSW), with changing electrode type according to geometry, has been carried out with constant weld time, weld current and weld pressure. Microstructure and hardness are depending on materials properties and weld parameter particularly heat input. Heat input is resulted from welding condition and parameters. Electrode tip type effects welding contact and heat transfer during RSW. Results showed that particularly spherical type electrode showed low heat input thus limited microstructure changing at heat affected zone. This have on positive effect on properties of the junctions. Depending on chemical composition of DP 600 harder phases generally formed at weld zone.
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Demir et al. (2020) studied this question.
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