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

Subject Areas :

محمد  خدائی ¹ (هیات علمی دانشگاه آزاد اسلامی- واحد شهر مجلسی)
جواد  مختاری 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.

References:

 

[1]    R. Mohammed & A. Hamza, “Optimized Stud Arc Welding Process Control Factors by Taguchi Experimental Design Techniqueˮ, INTECH publisher, http://dx.doi.org/10.5772/48166

 

[2]    Z. Lin, Y. Liu & J. He, “Behavior of stud connectors under combined shear and tension loads,” Eng. Struct., Vol. 81, pp. 362–376, 2014.

 

[3]    S. De Nardin & A. L. H. C. El Debs, “Study of partially encased composite beams with innovative position of stud bolts”, J. Constr. Steel Res., Vol. 65, No. 2, pp. 342–350, 2009.

 

[4]    I. Samardžić, I. Kladarić & Š. Klarić, “The influence of welding parameters on weld characteristics in electric arc stud welding,” Metalurgija, Vol. 48, No. 3, pp. 181–185, 2009.

 

[5]    P. Sforza & D. de Blasiis, “On-line optical monitoring system for arc welding”, NDT E Int., Vol. 35, No. 1, pp. 37–43, 2002.

 

[6]    B. Mi & C. Ume, “Real-time weld penetration depth monitoring with laser ultrasonic sensing system”, J. Manuf. Sci. Eng., Vol. 128, No. 1, pp. 280–286, 2006.

 

[7]    J. Antony, M. Hughes & M. Kaye, “Reducing manufacturing process variability using experimental design technique: a case study”, Integr. Manuf. Syst., vol. 10, no. 3, pp. 162–170, 1999.

 

[8]    K. Van Allen, “Apparatus and method for monitoring and evaluating weld quality”, Google Patents, 14-Oct-1997.

 

[9]    J. Soo LEE, Y. Soo RYU, N. In Kim, B. Joon KIM, Y. Kyung Kim, M. Hyun Kim, “Stud welding for fixation of cryogenic insulation of membrane tanks in LNG ship buildingˮ, Transactions of nonferrous metals society of China, Vol. 19, pp. 271-275, 2009.

 

[10] INTERNATIONAL STANDARD, Welding- Arc stud welding of metallic materials, ISO 14555, Second edition, 2006.