EFFECT OF WELD ANGLES ON BUTT WELD JOINT STRENGTH

The pipe welding failures are majority in process industries. While working the weld can repair or making new weld. We will study the V-groove geometry and finding out one geometry. The V-groove geometries we will make different models on pipe varying included angle from 450,500,550,600. Currently the V-geometry included angle using up to 450, but from studying the Indian Welding Journal, Indian Welding Society it is observed that if included angle increased up to 600 angular distortion decreases. This concept were using for regular V-groove but in this project using the V-groove with slotted portion at middle site of geometry. Because from studying different papers it is compared between different V-groove geometry that is new weld ,aged weld, full repair, partial repair-I, partial repair-II. So from these geometry selecting the partial repair-I that is Vgroove with slotted portion at middle site of geometry. Because this is gives more strength as well as life time. But this is only for 450 angle and for only V-groove not more than that. In this project will finding for 450,500,550,600. The tensile test has conducted to check that maximum tensile force sustain capacity. Also to check the welding quality and other parameters conducting the ultrasonic test as well as magnetic particle inspection test. To know the life time then calculating life time by conducting fatigue test. For all these tests make the four specimens for each test. From all these tests it is observed that tensile strength increased up to 76.64% for 600 angle as compared to 450 angle. Also fatigue life strength increased up to 46.15% for 600 angle as compared to 450 angle. No any defect found in the weld area that is welding quality is very good. So 600 angle is better than 450 angle.