Effects of Surface Preparations of Base Metal on the Butt Joint Strength of Mild Steel Brazed with BAg 8 : Effects of Roughness on Torsional Strength of Brazed Joint
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The relation between the base metal roughness and the torsional strength of mild steel brazed joint has been investigated in this experiment. To obtain some experimental data, some specimens (16^φ×105 mm) of mild steel rods (SS 41) and BAg8 filler metal were prepared. The surface of each specimen was identically polished with various emery papers (No.60, 240 and 600 mesh), and the specimens were machined by a milling cutter or ground by WA 60, WA 80 grinding wheels. These specimens were brazed with BAg8 filler metal (wt=0.1g) using a 35 KW resistance furnace operated in hydrogen atmosphere, and machined according to the scheme of Fig. 1. The torsional strength test of these specimens was carried out by a 50 kg-m torsional strength testing machine shown in Photo. 1. The torsional test of these specimens gave the results as follows : 1) The torsional strength of a specimen polished with No.600 mesh emery paper (R_<max>=0.6 microns) was very high, its value being 34.1 kg/mm^2 at the joint clearance 0.12 mm, but that of a specimen polished with No.60 mesh emery paper (R_<max>=15 microns) was lower, its value being 30.9 kg/mm^2 at the joint clearance 0.15 mm. 2) The torsional strength of a specimen ground by a WA 80 grinding wheel (R_<max>=0.8 microns) was excellent, its value being 35.5 kg/mm^2 at the joint clearance 0.18 mm, but that of a specimen ground by a WA 60 grinding wheel (R_<max>=1.6 microns) was poor, its value being 32.2 kg/mm^2 at the joint clearnace 0.11 mm. 3) In general, the torsional strength of a brazed joint with a smooth surface was greater than that of one with a coarse brazing surface due to the effect of residual stress of filler metal at the brazed joint. 4) As regards the relation between torsional strength and joint clearance, the torsional strength of a specimen with 0.12∿0.3 mm joint clearance was very high among the specimens polished with emery papers and those of specimens with other joint clearances were lower, and also, that of a specimen with 0.15∿0.25 mm joint clearance was high among the specimens machined or ground.
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関連論文
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