Welding method for gas shielded welding of aluminium-alloy vehicle body
A technology of aluminum alloy car body and welding method, which is applied in welding medium, welding equipment, welding equipment and other directions, can solve the problem of wasting high-quality raw materials, post-weld processing man-hours, increasing metal evaporation and dust generation, and welding heat-affected zone strength. Low problems, to achieve the effect of small metal splash and dust generation, short production cycle and small deformation
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Embodiment 1
[0046] An aluminum-magnesium alloy welding wire QT21 used for gas-shielded welding of aluminum alloy car bodies is composed of QT21 aluminum-magnesium alloy welding wire and QT21 flux. The diameter of QT21 aluminum-magnesium alloy welding wire is ф1.0mm, the surface finish reaches mirror surface, and the weight parts of chemical composition are: Al: 93.68; Mg: 5.1; Mn: 0.75; Cr: 0.2; Ti: 0.12; Zr: 0.12; Ce : 0.03. The chemical composition of QT21 flux is: Nocolok (K 3 AlF 6 +KAIF 4 Eutectic): 95%, CsF: 5%, the carrier is polyethylene glycol with a molecular weight of 200, and its proportion accounts for 30% of the total weight of the mixed flux.
[0047] The preparation method of the above-mentioned aluminum-magnesium alloy welding wire QT21 is carried out according to the following steps:
[0048] 1. Smelting and refining:
[0049] Put the proportioned amount of industrial pure aluminum (aluminum ingot) that has been preheated at 400°C for 4 hours into a graphite crucibl...
Embodiment 2
[0064] The difference from Example 1 is that the weight parts of the aluminum-magnesium alloy welding wire QT21 are: Mg: 5.0; Mn: 0.7; Cr: 0.18; Ti: 0.10; Zr: 0.10; Ce: 0.03. Al: margin.
[0065] Preparation: Step 1, adding master alloys such as Al-Mg, Al-Mn, Al-Cr, Al-Ti, Al-Zr and Al-Ce to the molten pure aluminum liquid at 700°C at the same time, all master alloys Both were melted and stirred for 3 minutes, and argon (Ar 2 ) and HCH (C 2 Cl 6 ) Refined for 10 minutes and allowed to stand for 15 minutes before removing slag. Cast the refined alloy melt into a test bar for sampling inspection. The weight percentage of its chemical composition is: Mg: 5.0%; Mn: 0.7%; Cr: 0.18%; Ti: 0.10%; Zr: 0.10%; Ce: 0.03 %. Al: margin. All the other are with embodiment 1.
Embodiment 3
[0067] The difference from Example 1 is that the chemical composition of aluminum-magnesium alloy welding wire QT21 is: Mg: 4.9, Mn: 0.65, Cr: 0.15, Ti: 0.09, Zr: 0.15, Ce: 0.02, Al: the balance.
[0068] The ratio of the flux to the carrier (polyethylene glycol with a molecular weight of 400) is 7.5:2.5.
[0069] During the preparation: Add the master alloys such as Al-Mg, Al-Mn, Al-Cr, Al-Ti, Al-Zr and Al-Ce to the molten pure aluminum liquid at 710°C at the same time, and all the master alloys are melted After stirring for 3 minutes, argon (Ar 2 ) and HCH (C 2 Cl 6 ) refining for 12 minutes, after slag removal, carry out continuous casting and rolling and wire drawing and polishing treatment, select samples from the product, and randomly check the chemical composition. The weight parts of the chemical composition are: Mg: 4.9, Mn: 0.65, Cr: 0.15, Ti: 0.09, Zr: 0.15, Ce: 0.02, Al: balance. All the other are with embodiment 1.
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