Effect of Additives and Welding Current on the Hardness of Weld Metal in the Submerged Arc Welding Process
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Abstract
This research aimed to examine the effect of type and mass of additives and welding current on the hardness of weld metal in the submerged arc welding process. Three types of additives were used in this research including carbon, silicon carbide and carbon-silicon carbide mixture. Three amounts of each additive were used in this research including 1, 2 and 3 grams. Three welding currents were used in this research including 430, 500 and 570 amperes. During welding, the welding voltage and welding speed were kept constant at 30 V and 15 inches per minute, respectively. After welding, weld metal specimens were subjected to chemical composition analysis, microstructure examination and Rockwell C hardness testing. The results demonstrated that the specimen derived from the welding with 3 grams of carbon addition and 430 amperes of welding current was the specimen having the highest hardness value of 47 HRC and the highest carbon content of 1.34%. This specimen was hypereutectoid steel whose microstructure consisted of pearlite and carbide. From the statistical analysis, it was found that the main factors influencing the hardness of weld metal were mass of additives and the interaction effect between mass of additives and welding current.
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บทความที่ได้รับการตีพิมพ์เป็นลิขสิทธิ์ของ วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยอุบลราชธานี
ข้อความที่ปรากฏในบทความแต่ละเรื่องในวารสารวิชาการเล่มนี้เป็นความคิดเห็นส่วนตัวของผู้เขียนแต่ละท่านไม่เกี่ยวข้องกับมหาวิทยาลัยอุบลราชธานี และคณาจารย์ท่านอื่นๆในมหาวิทยาลัยฯ แต่อย่างใด ความรับผิดชอบองค์ประกอบทั้งหมดของบทความแต่ละเรื่องเป็นของผู้เขียนแต่ละท่าน หากมีความผิดพลาดใดๆ ผู้เขียนแต่ละท่านจะรับผิดชอบบทความของตนเองแต่ผู้เดียว
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