Friction Welding of Titanium and Carbon Steel

概要

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Titanium-steel is a combination of dissimilar materials, which are difficult to weld in general, owing to inevitable formation of brittle intermetallic compounds. A prominent feature of friction welding process is ability to weld dissimilar materials in many kinds of combinations. This report deals with friction weldabilily of pure titanium and S25C steel, which are 12 mm in diameter. Main results are summarized as follows; (1) Suitable welding conditions to obtain a sound weld, which has a joint efficiency over 100%, are rotational speed: 2440 rpm, friction pressure: 20 kgf/mm^2, upsetting pressure : 24 kgf/mm^2, friction time: 2.5-5.0 s. (2) Bond condition at central part of weld interface has a great influence on tensile strength of joint. (3) The welded joints fracture at titanium base metal in rotary bending fatigue test. It shows that fatigue limit of the weld must be over that of base metal, 24 kgf/min^2. (4) A joint, made even under suitable welding conditions, has low bending ductility and impact value. (5) Tensile fracture takes place in the heat-affected zone of S25C steel at central part of weld. However, the intermetallic compounds at peripheral and middle parts cause a brittle fracture of weld.
社団法人溶接学会の論文
1985-04-01