Mechanical Properties of Laser Welded CAC403 Copper Alloy Casting and SUS304 Stainless Steel Welded Joints

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  • レーザ溶接したCAC403銅合金鋳物とSUS304ステンレス鋼溶接継手の機械的性質
  • レーザ ヨウセツ シタ CAC403 ドウ ゴウキン イモノ ト SUS304 ステンレス コウ ヨウセツ ツギテ ノ キカイテキ セイシツ

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Abstract

Analysis was carried out on defect formation and its causes, as well as on microstructures, mechanical properties and the like, for butt welds formed by the laser welding of dissimilar metal using copper alloy castings (CAC 403) and austenitic stainless steel (SUS 304). <br>  As a result, weld cracks were partly identified in the heat-affected zone between the CAC 403 and SUS 304 materials. The cracks are thought to be due to heat stress caused by the variation of linear expansion coefficients between the two base metals. <br>  The fusion zone affects fine dendritic microstructures, and a number of small and large white spheric microstructures were identified in such dendritic microstructures. In addition, EPMA analysis of the fusion zone indicated that areas with smaller traces of Cu, Sn, and Zn tend to contain larger amounts of Fe, Ni, and Cr contrastively. <br>  On the other hand, welded joints presented a tensile strength of 178MPa and had an average joint efficiency of 89%, for CAC 403 base metal before welding. Moreover, the joints had an elongation of 5.8% on average, and breaking of the joints began from a position in the base metal. Furthermore, welded joints had impact values slightly lower than those of the CAC 403 base metal before welding. In addition, the welded joints decreased in plane bending fatigue limit to as low as approximately 10MPa, compared to that of the CAC 403 base metal before welding. Finally, the welded joints had a plane bending fatigue limit ratio of 0.42.

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