The Effect of Variation of MIG Welding Current on ASTM A106 Steel Pipe on Tensil, Hardness Testing and Micro Structure Testing Using ER70S-6 Electrode

Fauji, Nanang Nur and Ramadhan, Fahad (2022) The Effect of Variation of MIG Welding Current on ASTM A106 Steel Pipe on Tensil, Hardness Testing and Micro Structure Testing Using ER70S-6 Electrode. Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.

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Abstract

MIG ( Metal Inert Gas ) welding process is the heat from a welding process generated by the welding are formed between the workpiece and the wire electrode . This study amalyzes the effect of MIG ( Metal Inert Gas ) welding results on variations in welding currents of 15 A , 20 A and 25 A on changes in tensile and hardness mechanical properties and changes in microstructure . The purpose of this study was to determine the effect of variations in MIG ( Metal ) welding current . Inert Gas ) to changes in temsille and hardness mechanical properties and changes in microstructure . The material to be tested in this research is ASTM A106 carbon steel pipe material with a material thickness of 8 mm . The MIG ( Metal Inert Gas ) welding process with a current variation of 15 A. 20 A and 25 A is carried out by means of two welding with the same current variation as the IG welding position . The results of the tensile test obtained the highest maximum tensile strength value of 46.12 kg / mm2 , then the lowest value obtained was 43.75 kg / mm2 . For hardness testing , the mean highest value is 59.3 HRC on 25 A specimen , then the lowest value obtained is 56.9 HRC on 15 A specimen . For changes in microstructure , the largest percentage of ferrite is 42 % in 25 A specimen , then the lowest value is 40 % on specimen 15 A focus in weld metal . This shows that the variation of current in MIG ( Metal Inert Gas ) welding greatly affects the microstructure of the material so that it also affects the value of tensile strength and strain as well as the strength of the material's hardness . tensile strength value , the lower the hardness value , the higher the maximum tensile strength value produced , the greater the welding current , the greater the toughness of the ASTM 4106 material as a result of MIG ( Metal Inert Gas ) welding . Keywords : Steel Pipe, Mechanical Properties, MIG Welding

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