Repeated Weld Repair and its Influence on Welded Carbon Steel

Abstract

Abstract: Weld repair usually comprises of mechanical removal of weld part and redisposition of the filler wire using the same parameters. The defect may be removed by carbon arc gauging and grinding or machining. The strength and the microstructure of the material will changed when the repeated weld repair is applied to the material at the same area. The purpose of this study is to compare and identify the angle of distortion, hardness, and tensile strength and bend strength and to analyze the macro and microstructure between repairing method using carbon arc gauging and mechanical grinding process with the same number of repairing sequence. The result proved that repairing A36 steel increased the strength of the material itself but the ductility was decrease when the number of repair increases. It can be concluded that, the repair using carbon arc gauging can't be applied to repair weld joint for material because it's more significant to change the material process compared to mechanical grinding. Overall, the mechanical grinding technique is the most suitable practice which can serve as the suitable method for repairing the weld defect if the repaired focus area received high impact loads.

Efek Perbaikan Las Berulang (Multilayer Repair Welding) pada Baja Carbon SS400 terhadap Struktur Mikro dan Kekerasan

“…Perbaikan las pada umumnya terdiri dari pelepasan bagian las dan penempatan ulang elektroda las pada bagian tersebut menggunakan parameter yang sama. Memperbaiki bagian las akan menyebabkan siklus termal tambahan, yang dapat merubah sifat fisis dan mekanis dari material hasil pengelasan [4]. Penelitian tentang perbaikan hasil las pernah dilakukan oleh Muhamad dkk., pada penelitian tersebut material Duplex Stainless Steel UNS S32760 yang sebelumnya telah mengalami pengelasan dilakukan perbaikan las menggunakan metode SMAW.…”