Pengaruh Parameter Pengelasan Spot Welding terhadap Kekuatan Geser pada Aluminium Silaban, Valco Fakultas Teknik Waskito, Waskito Purwantono, Purwantono Ambiyar, Ambiyar Jasman, Jasman Nurdin, Nurdin thesis https://repository.unp.ac.id/id/eprint/42486/ https://repository.unp.ac.id/id/eprint/42486/1/final_B1_07_%20VALCO_%20SILABAN_1102216_966_2016.pdf open access 2016-02 SPOT WELDING SHEAR STRESS ALUMINIUM LAP JOINT WELDING TIME