Abstract
Al-steel, which has a high heat-resistance property, is welded by the general coated electrode and Ni-Cr type electrode with manual arc welding method or by the swaged wire electrode from the same component plate with tungsten innert gas arc welding method, submerged welding method and bare electrode D.C manual arc welding method.
The results of mechanical test for weldment by each methods show that the elongation at room te-mperature is very low as compared with base metal, and it is not recovery by the post heat treatment at 700-900°C.
According to the measureing results of scale rate for the elevated heat in the range 150-950°C during 3 monts, that of the deposit metals welded by the swaged wire electrodes are in the range 4.9-8.2 %, that by the Ni-Cr type electrodes are 9.3-17.6% and that by the general coated electrodes are 27.5-38.7%.
To conclude the examination results of appearences of weldment, X-ray photo-graphy, hardness test and microstructures, tungesten innert gas arc welding method used the swaged wire electrode obtains the best weld joints.
