The effect of surface roughness and the current on the strength of stud welded pin

Subject Areas :

محمد خدائی ¹ , جواد مختاری ²

1 - هیات علمی دانشگاه آزاد اسلامی- واحد شهر مجلسی
2 - فارغ التحصیل کارشناسی ارشد، دانشگاه آزاد اسلامی واحد شهر مجلسی

Received: 2017-01-13 Accepted : 2017-03-07 Published : 2018-06-22

Keywords: Microstructure, Plane Carbon Steel, Stud Welding,

Abstract :

Fast pin connecting to the steel parts to fasten cables and wires to the pipelines, anchors inside the cements to the steels structures and bolts inside the tanks is possible just using stud welding method. In this method an electric arc is established between pin and base metal, and partially melt their surfaces, then by applying a pressure, pin and base metal will be jointed. Some parameters such as surface roughness, time of electric arc, the thickness of base metal and current, affect the quality of stud welding. In this research, steel pins are connected to a steel base metal at three different surface roughness and three different current using stud welding method. Results of scanning electron microscopy (SEM) indicates that when the surface of base metal is rough, the interface of joint increases from 50 to 95 percent by increasing the current from 160 to 200 ampere. But that when the surface of base metal is smooth, the interface of joint between pin and base metal decreases from 95 to 50 percent by increasing the current from 160 to 200 ampere. Also the interface of pin and base metal solidify in martensitic form, and the results of microhardness measurement confirms the higher harness of the interface regarding base metal and pin. According to the results of tension test, the maximum strength (400 MPa) was related to the P60-200A sample.

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