Linear friction welding method
A linear friction welding and welding process technology, which is applied in the field of variable amplitude linear friction welding and variable frequency, can solve the problems of poor quality of welded joints, etc., and achieve the effects of prolonging service life, eliminating residual stress, and uniform high temperature range
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[0013] Example 1: A TC4 titanium alloy linear friction welding test was carried out using the method of the present invention. The length of the welding test piece is 46mm, the welding cross-section is 15mm×18mm, and the vibration and friction are along the 18mm dimension during welding. The process parameters are: the vibration frequency linearly increases from 10Hz to 30Hz within 2 seconds of the initial friction; after that, it enters the friction stage of constant frequency 30Hz and constant amplitude 1.5mm, which lasts for 2 seconds; then the amplitude gradually decreases from 1.5mm to 1.5mm within 2 seconds 0. The friction pressure is 20MPa, and the upsetting pressure is 60MPa.
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[0014] Example 2: The linear friction welding test of No. 45 steel was carried out using the method of the present invention. The length of the welding test piece is 46mm, and the welding cross-section is 20mm×60mm. During welding, it vibrates and rubs along the dimension of 60mm. The process parameters are: the vibration frequency linearly increases from 20Hz to 60Hz in the initial 3 seconds of friction; then it enters the friction stage of constant frequency 60Hz and constant amplitude 2.0mm, lasting 8 seconds; then the amplitude linearly decreases from 2.0mm to 60Hz within 3 seconds 0. The friction pressure is 50MPa, and the upsetting pressure is 100MPa.
Example Embodiment
[0015] Example 3: The linear friction welding test of No. 45 steel was carried out using the method of the present invention. The length of the welding test piece is 46mm, the welding cross-section is 30mm×80mm, and the vibration and friction are along the 80mm dimension during welding. The process parameters are: the vibration frequency linearly increases from 30Hz to 90Hz in the initial 4 seconds of friction; then it enters the friction stage of constant frequency 90Hz and constant amplitude 3.0mm, which lasts for 12 seconds; then the amplitude linearly decreases from 3.0mm to 90Hz within 4 seconds 0. The friction pressure is 80MPa, and the upsetting pressure is 160MPa.
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