Abstract
The welding process can occur in shipbuilding with steel material. The purpose of this study was to determine the effect on welding. this research was conducted welding with different amperes with heat annealing treatment. The welding process used in ASTM A36 steel carbon welding or Shielded Metal Arc Welding (SMAW) with 9 mm thickness. Finally, a test was conducted including A36 carbon steel content test, NDT test, tensile test, and microstructure test. The result showed that the highest tensile stength value was 559,410 MPa in speciation 1 with 110 amide and the lowest tensile strength value of 556,473 MPa at 60 amperes. The NDT test using chemical substance showed that there was undercut on the welding in speciation 1 with amperage 60 amperes; while, speciation 2 with 110 Volt amperage there is no undercut in the welding area. From the results of the structure test microstructure showed that the pearlite and ferrite grains are formed smaller and tight because there is the influence of heat that is given in welding process, in which the smaller the number the greater the number of hardness of a material.
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