| In the aspects of economical design, it is very important to weld carbon steel and stainless steel for many industrial plants. But because of many differences between these two materials, it is very difficult to select not only proper welding conditions but also optimized conditions of post heat treatment for improvement of mechanical properties of welds. In this study, to find those conditions, submerged are welding were performed and three conditions of post weld heat treatment (PHHT) were adopted, i.e. at 650℃, 1,000℃, for 1.5 hrs respectively and then measured the variation of mechanical properties of welds The results obtained are as follows: 1. Weldability of carbon steel and stainless is good, because there are no fractures and cracks at the weld deposit and the interfaces between weld deposits and base metals under the tensile stress. 2. Tensile strength of the welds heat treated at 850℃ is higher than those of others. 3. The impact energy of HAZ of carbon steel shows highest value when heat treated at 850℃, whereas weld deposit metal and HAZ of stainless steel show the highest impact values when heat treated at 1000℃ and as welded, respectively. |
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