25 research outputs found
Degradation of joints in ODS ferritic stainless steels
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Hardfacing of 3.5% Chromium Cast Steel by Flux Cored Wire Arc Welding Process
No full textHardfacing weld is a technique which mainly improves and extends the useful life of engineering components. The purpose of this research is to improve welding procedure for one layer and three layers hardfacing of 3.5% Chromium cast steel and to study wear behavior of hardfacing layers. Flux Cored Wire Arc Welding (FCAW) process has been used as a welding process of this research by choosing austenitic stainless steel and martensitic hardfacing wire to weld the buffer and hardfacing layer respectively. Preheating was also used in this study. Abrasive wear test of hardfacing deposit were conducted in accordance with procedure “A” standard of ASTM G65. In addition, microstructures and macrostructure of worn surface deposits were analyzed by using optical microscope. These results showed that there is no crack and defect in the Heat Affected Zone (HAZ) and other regions. The hardness of preheating sample in HAZ regions was lower than the ones without preheating. Therefore, preheating samples should be done before welding. The abrasive wear resistance of three layers hardfacing deposit was better than one layer hardfacing deposit because one layer hardfacing deposit was more diluted from buffer layer than three layers hardfacing deposit. Moreover, weight loss of one hardfacing layer was also higher than three layers.</jats:p
The comparison of weld metal with and without additional powder using submerged arc welding
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Effects of the austenitic buffer layer on abrasive mass losses of alloys hardfaced with a martensitic layer using submerged arc welding
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Microstructural and mechanical properties of welded SSM356-T6 and SSM7075-T6 aluminum semi-solid sheets by friction stir welding
No full textFriction Stir Welding (FSW) was the welding process applied in this research to join different grades of aluminum alloy sheets Semi-Solid Metal (SSM) 356-T6 and 7075-T6. The test pieces have dimensions of 50 mm × 100 mm × 4 mm. The effect of tool rotational speed on metallurgy, and mechanical properties of welding was investigated. Dissimilar butt joints were produced by using cylindrical pin with conditions of different tool rotation speed (710, 1,000 and 1,400 rpm) and welding speed (80, 112 and 160 mm/min). The welding microstructures showed three different areas including base metal, stir zone and thermo mechanical affected zone, which were directly affected by the rotation speed of tool. The butt joint rotation speeds 1,000 rpm provided the average maximum tensile strength 246.33 MPa. Rotational speed allowed material flow from the from to the rear of the tool. The heat generated from friction lead to microstructural change and promote good mix and adhesion of both materials
Effect of post-weld heat treatment on microstructure and mechanical properties of friction stir welded SSM7075 aluminium alloy
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