Method for pulsed argon arc welding of titanium alloy and pure aluminum
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A technology of argon arc welding and titanium alloy, applied in arc welding equipment, welding equipment, welding medium, etc., to achieve the effect of convenient and flexible application, improved arc stability, flexible and simple operation
Inactive Publication Date: 2012-08-01
SHANDONG UNIV
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[0005] In order to solve the technical problem that the existing diffusion welding technology is difficult to realize the connection of titanium and aluminum dissimilar metals under arc welding conditions, the invention provides a pulsed argon arc welding method of titanium alloy and pure aluminum dissimilar light metal alloy, which has the ability to obtain crack-free , Welded joints without brittle phases, which can meet the requirements for the use of titanium alloys and pure aluminum special-shaped structures in production, etc.
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Embodiment 1
[0029] Pulse argon arc welding of Ti-6Al-4V titanium alloy and 1060 industrial pure aluminum. The size of the Ti-6Al-4V titanium alloy plate is 160mm×80mm and the thickness is 1.5mm; the size of the 1060 industrial pure aluminum plate is 160mm×80mm and the thickness is 2mm.
[0030] The specific process steps of titanium alloy and pure aluminum pulse argon arc welding are as follows:
[0031] (1) Aluminum-silicon alloy welding wire with a diameter of 1.0mm is used as the filler metal, and the surface of the welding wire is polished with sandpaper to reveal a metallic luster before welding. The chemical composition (mass fraction) of the aluminum-silicon alloy wire used is: Si 5.5%, Fe 0.8%, Cu 0.3%, Mn 0.05%, Mg 0.05%, Zn 0.10%, Ti 0.25%, and the rest is Al.
[0032] (2) Polish the butt joint between Ti-6Al-4V titanium alloy and 1060 industrial pure aluminum with sandpaper, so that the surface to be welded is exposed to metallic luster, and the surface roughness reaches Ra1.6...
Embodiment 2
[0037] Pulse argon arc welding of corner joints between Ti-6Al-4V titanium alloy and 1060 industrial pure aluminum box body. The size of the Ti-6Al-4V titanium alloy plate is 120mm×120mm and the thickness is 2.0mm; the size of the 1060 industrial pure aluminum plate is 120mm×120mm and the thickness is 2mm.
[0038] The specific process steps of pulse argon arc welding of titanium alloy and pure aluminum corner joints are as follows:
[0039] (1) Aluminum-silicon alloy welding wire with a diameter of 1.2mm is used as the filler metal, and the surface of the welding wire is polished with sandpaper to reveal a metallic luster before welding. The chemical composition (mass fraction) of the aluminum-silicon alloy wire used is: Si 5.5%, Fe 0.8%, Cu 0.3%, Mn 0.05%, Mg 0.05%, Zn 0.10%, Ti 0.25%, and the rest is Al.
[0040] (2) Polish the butt joint between Ti-6Al-4V titanium alloy and 1060 industrial pure aluminum with sandpaper, so that the surface to be welded is exposed to metall...
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Abstract
The invention discloses a method for pulsed argon arc welding of a titanium alloy and pure aluminum. The method comprises the following steps of: polishing a silicon-aluminum alloy filling welding wire by using a piece of fine sand paper before welding; and before the pulsed argon arc welding, polishing a chamfer angle at a joint on one side of the titanium alloy, scraping a joint on one side of the pure aluminum, and butting flat plates of the titanium alloy and the pure aluminum. The welding parameters of the pulsed argon arc welding are that: the background current is 40 to 60 A, the pulse current is 38 to 80 A, the pulse duration is 5 to 10 s, the pulse frequency is 35 to 65 Hz, the welding voltage is 8 to 16 V, the argon flow is 6 to 18 L/min, the distance between a welding gun nozzle and a workpiece is 8 to 12 mm, and the included angle between a welding gun tungsten electrode and the workpiece is 70 to 85 degrees. The welding gun is cooled after welding, and the cooling mode is preferred to be water cooling mode. According to the method for pulsed argon arc welding of the titanium alloy and the pure aluminum, the arc stability is obviously improved, the tensile strength of a welding joint is not lower than the tensile strength of a pure aluminum parent metal, and the operating requirements on titanium alloy and aluminum welding components in production can be met.
Description
technical field [0001] The invention belongs to the field of welding technology, and relates to a welding method of dissimilar nonferrous metals, in particular to a pulsed argon arc welding method of titanium alloy and pure aluminum. Background technique [0002] Using a single material in modern engineering often cannot meet various requirements in practical applications. From the perspective of energy saving and emission reduction, the use of materials with different properties under different working conditions can meet the performance advantages of different materials, and dissimilar light metal welded structures have attracted more and more attention. Aluminum has the characteristics of high specific strength, low density, good corrosion resistance, good thermal conductivity and electrical conductivity, and is the main lightweight structural material. Titanium alloy has the characteristics of small linear expansion coefficient and elastic modulus, excellent corrosion r...
Claims
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