Abstract
Joining Most of the repair weld of parts and components cannot be avoided in any manufacturing industry. Weld procedure is commonly used to ensure the welded parts can be useful and safe. Weld repairs have to be carried out with suitable care and avoid premature failures of the weld components. The weld repairs often occur repeatedly on welded parts. Hence the investigation was done to evaluate the effects of repeated weld-repairs of austenitic stainless steels plates on both mechanical and microstructural properties. Weld samples were joined using gas tungsten arc welding (GTAW) with several numbers of weld repairs. The first weld was performed to join metal plates and assigned as 0R. The weld bead was then ground away and followed by the first weld repair using the same GTAW (designated as 1R). This repair process was continual until five times (identified as 5R). All specimen was characterized by the chemical composition test, the microstructure observation, and the mechanical tests. It was found that the HAZ hardness of repeated weld repair decreased when the number of repairs increased. The tensile test results of the repeated weld repair had a few effects on tensile strength. However, the result of the impact test on repeated weld repairs shows a substantial reduction in the toughness properties as the repeated number of weld repairs. The repeated weld repair influenced the mechanical properties of austenitic stainless steel plates and showed a tremendous decrease compared with the type of 304L stainless steel as the repeated numbers of weld repairs.
Highlights
Stainless steels are mostly in use for many engineering applications because of superior corrosion resistance together with the great mechanical properties
3.1 Microstructure analysis Micrographs of optical microscopy (OM) of the base metal stainless steel plates (BM), and the HAZ repaired weld of 0R, 1R, 2R, and 5R samples are shown in Fig.3 and Fig 4
The microstructure of HAZ exposed to the first weld repairs (R0) showed the finer lathy shaped delta ferrite compared with the HAZ of, the higher weld repair (1R to 4R)
Summary
Stainless steels are mostly in use for many engineering applications because of superior corrosion resistance together with the great mechanical properties. Many investigators study the repeated weld repair on the stainless steels type 304L and 316L affected by alloying, temperature treatments and joining techniques on microstructures, high temperature and cyclic properties [5,6]. Lin et al [8] studied the properties on stainless steel 304L due to the influence of repeated weld repair. [9] The investigation of the influence of several weld repairs on a clad plate of stainless steel showed that the repeated weld repair resulted decreased the longitudinal and transverse residual stress. In the present study, the repeated number of repaired weldment was evaluated by the comparative study on microstructure and mechanical properties such as tensile strength, toughness, and hardness to avoid several short-term repairs or replacements
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