Effect of welding sequence and welding current on distortion, mechanical properties and metallurgical observations of orbital pipe welding on SS 316L

Orbital pipe welding was often used to manufacture piping systems. In orbital welding, a major challenge is the torch’s position during process, so that additional methods are needed overcome these challenges. This paper discusses influence of sequence and current on distortion, mechanical properties metallurgical observations in with SS 316L square butt joints. The variation parameters sequence. 100 A, 110 120 while one sequence, two sequences, three four sequences. results will be analyzed from distortion measurement, test observations. Distortion measurements made before after welding. Testing includes tensile tests microhardness tests, include macrostructure microstructural show maximum axial transverse ovality, taper occurred at A sequences 445 µm, 300 195 275 respectively. decrease ultimate strength 51 % compared base metal’s strength. Horizontal vertical produces greatest value, but there value using different depths penetration each position. largest smallest depth 4.11 mm 1.60 mm, respectively