การซ่อมบำรุงเพลาหางยาวในระบบส่งกำลังของเรือประมงพื้นบ้าน "กอและท้ายตัด"ด้วยกรรมวิธีการเชื่อมซ่อมพอกผิว

Abstract

This research was aimed to study the efficiency of metal arc welding resurface processes to extend the service life of long tail propeller shafts of the local fishing boats. The study was initiated with the identification of the main cause of the deterioration of the shafts. The tested materials were conducted by different metal welding processes using Flux Cored Arc Welding Process (X111-T5-K4 and E71T- 1CH8/T/9M-D core wires) and Shield Metal Arc Welding Process (E7016 core wire) and determined the mechanical properties consisting of the resistance of metal fatigue, corrosion and mass loss. Comparison among the aforementioned different welding processes were carried out to evaluate and select the best efficiency of metal arc welding resurface processes for repairing the reused shafts. The result revealed that the new process could extend the service life longer than that of the conventional one with the resistance of metal fatigue of 97,896 number of cycle, corrosion rate at 4.078 mm/year, mass loss at 29.2 grams/year and the average service life of 2 years as compared to 0.5 year of the conventional one. The result of this study will certainly reduce the fishing cost of local fishermen and prevent marine integrity of the coastal area from incomplete engine from fishing boat.