The Effect of Post Weld Heat Treatment in Multi Layer Welding on Tensile Strength and Hardness

Abstract:

Post weld heat treatment is heating objects in the furnace to certain temperatures and times after the object has been welded. PWHT is expected to reduce residual stress on objects due to the welding process. In this case, we warm up annealing (holding in a furnace) at a temperature of 750 °C with a heating time of 40 minutes. We use MIG welding (metal inert gas) and a metal filler FS 705-6 with a diameter of 0.8 mm, with a total of 3 layers. First, the object will be formed according to the standard and welded in three layers with MIG welding. Then, the object will be cut and formed according to the tensile test standards, after which the tensile test and hardness test will test it to determine the mechanical characteristics of the object. From the testing that has been carried out, it is known that objects without PWHT have a higher stress and hardness value than objects with PWHT, with a stress value of 346.57 MPa and the highest hardness value of 93.5 HRB at the 3rd welding point. However, objects with PWHT have higher elasticity and strain values, with an elasticity value of 3.32 MPa, and the strain value of objects with PWHT is 13.1.

• Periodical: Materials Science Forum (Volume 1138)
• Pages: 29-38
• DOI: https://doi.org/10.4028/p-sJljW6
• Online since: December 2024
• Authors: Muhammad Rifqi Anggoro*, Agus Dwi Anggono
• Keywords: Elasticity, Hardness, Multilayer Welding, PWHT, Residual Stress, Tensile

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