Relation Between the Surface Roughness and the Residual Stress of BAg-8 Brazed Mild Steel Joint

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This paper presents some experimental evidence of residual stress measured by X-ray stress measuring process and hardness distribution measured by micro-Vickers hardness tester. To obtain some experimental data, 10×32×2.6 mm mild steel as the base metal and BAg-8 as a filler metal were prepared, and the abutting surfaces of base metals were polished with various emery papers (60, 120, 240, 400 and 600 mesh) to set up various roughnesses on the brazing surface. These specimens were brazed with BAg-8 filler metal in a 35 kW resistance furnace operated in hydrogen atmosphere. Residual stress measurement was carried out by means of an X-ray stress measuring diffractometer manufactured by Tokyo Shibaura Electric Co. These examinations gave the results as follows : 1) Residual stress of a brazed joint with coarse surface was larger than that of one with smooth brazing surface. 2) Residual stress of y direction (Fig. 7, 8) was larger than that of x direction ; it is considered that these phenomena were caused by soliditic shrinkage of filler metal at the brazed joint. 3) Most of these residual stresses were tension stresses, their maximum value being 4.5 kg/mm^2 and their minimum value being 0.1 kg/mm^2.
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