異種金属の抵抗溶接法の検討(第 2 報) : 炭素鋼とチタン, 鋳鉄のプロジエクション溶接

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A particular projection welding was carried out for welding dissimilar metals as the way previously reported. Two pairs of dissimilar metals, namely, carbon steel (C steel) disc with ring projection and pure titanium block, low alloy steel (LA steel) disc wirh ring projection and cast iron block, are welded respectively. Main results of this study are as follows; (1) In C steel-titanium weld joint, the welding strength depens more loosely on the projection sharpness than in C steel-cast aluminum alloy weld joint previously reported. The low thermal conductivity of titanium causes the temperature of the projection to decay monotonously from the top to the bottom during welding, therefore projection does not collapse in its middle portion differenig from C steel-cast aluminum alloy weld joint. (2) In C steel-titanium weld joint, the shorter welding time leads to the higher weld strength because of its smoller heat input. Large heat input causes the formation of intermetalliccompounds in cooling process after welding. (3) C steel-titanium weld joint having the tensile strength equivalent to that of titanium base metal (36kg/(mm)^2) can be gotten, using next welding factors. The ring projection diameter is 22mm, its corsssection is isosceles-trapezoid, height 2mm, top width 0.5mm, bottom isotropic angle 80°, and the welding current is 60KA, weld time 0.5 cycle (8.3msec), electrode force 2.2 ton. (4) In LA steel-grey cast iron joint, the weld strength remains at most the half of grey cast iron base metal strength (23kg/(mm)^2) because of the disposition of flaky graphite parallel to weld surface. But in LA steel-nodular cast iron joint, the weld strength rises as high as 90% of base metal tensile strength (41kg/(mm)^2), using next welding factors : The ring projection diameter is 30mm, its crossection is isosceles-trapezoid, height 2mm, top width 0.5mm, bottom isotropic angle 70°, and the welding current is 69KA, welding time 3 cycles (50 msec), electrode force 1.6 ton. (5) According to the estimations of the temperature distribution in weld joints by calculation, the differences of the plastic flow caused by the projection sharpness are explained qualitatively, and the various characteristics of plastic flow in C steel-cast aluminum alloy, C steel-titanium, LA steel-cast iron weld joints can be explained. (6) Practically to weld dissimilar metals using this method, condenser welder is better than any other welders for its stability and efficiency, and spring-attached electrode is indispensable.
社団法人溶接学会の論文
1980-10-05

異種金属の抵抗溶接法の検討(第 2 報) : 炭素鋼とチタン, 鋳鉄のプロジエクション溶接

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