ã€China Aluminum Network】 7050 aluminum alloy is a kind of superhard aluminum alloy material that can be heat-treated and strengthened. It is convenient for casting, has good formability and has excellent induction function. Because the aluminum alloy arc welding seam often suffers defects such as blowholes, cracks, undercuts, etc., especially with regard to heat-strengthened ultra-high-strength aluminum alloy, its arc welding weldability is worse, it is prone to hot cracks, severely prevented the 7050 aluminum The use of alloys in industry. Mixing conflict welding (FSW) is an efficient, high-quality, environmentally-friendly, low-cost new welding method that can perform excellent welding on 7xxx series high-strength aluminum alloys. This article selects the 8mm 7050-T7451 aluminum alloy plate for single-channel butt mixing and conflict welding experiments, and analyzes the arrangement and mechanical functions of the joints.
The welding test data is 8mm thick 7075-T7451 aluminum alloy, H13 hot die steel is used for the mixing head data. The chemical etching solution is 15ml HCl+1mlHF+2.5mlHNO3+95mlH2O; the arrangement characteristics of the weld zone are investigated under the microscope OptelicsTMS130; the tensile test is performed on the CSS-44100 electronic all-round tester; the hardness measurement is performed on the HX-1000 microhardness tester .
The dynamic recrystallization of the nugget zone is followed by the formation of fine equiaxed crystals; the heat affected zone is arranged in arcs under the effect of mechanical force and thermal cycle; the grain arrangement in the heat affected zone is coarsened. When the rotation speed is 375r/min and the welding speed is 100mm/min, the tensile strength of the joint is relatively high and can reach 88.6% of the base metal. The spread of weld hardness appears "W" shape, with the smaller value appearing at the transition between heat-affected zone and heat-affected zone on the retreat side.
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