This research studied the rate of fast torch gas welding, mechanical arm cover Kawasaki model RA10N which affect the grade of steel SS400, size, thickness 3 mm, made of steel plate welding seam width 2 pieces 2.5 cm long, 10 cm in order to find out the speed of the welding torch is the appropriate welding factors is the potential difference and current measure results by comparing the characteristics of the physical test weld with mechanical property toughness testing by impact.
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