Friction stir spot welding method of magnesium alloy steel keyless hole
A technology of spot welding and friction stir, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of difficult steel/magnesium connection, limited solid solution, etc., and achieve small deformation, beautiful appearance and high quality high effect
Inactive Publication Date: 2012-01-18
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
It is precisely because the properties of magnesium and iron are quite different, and magnesium and iron can only be limited to solid solution, so it is difficult to solve the steel / magnesium connection by fusion welding
Method used
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[0012] like figure 1 , figure 2 , image 3 Shown, the present invention is magnesium alloy-steel without keyhole friction stir spot welding welding method, and its steps are:
[0013] (1) Using the friction head 1 without stirring needle, the steel plate 2 is on top and the magnesium alloy plate 3 is on the bottom;
[0014] (2) Drive the friction head to rotate and rub on the steel plate for 1-15 seconds to generate heat to soften the steel plate;
[0015] (3) Then the friction head presses down and squeezes the steel plate. When the lower surface of the friction head is pressed down to 0.1-0.4mm on the upper surface of the steel plate, it stays at this depth for 1-15 seconds. The upsetting force of the friction head and the rotation of the friction head Friction with the steel plate generates frictional heat and plastic flow to effectively remove oxides on the surface of the material, making the steel-magnesium interface clean;
[0016] (4) Utilize the upsetting and rota...
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The invention relates to a friction stir spot welding method of a magnesium alloy steel keyless hole. The method comprises the following steps of: (1) lapping a steel plate and a magnesium alloy plate by using a friction head without a stirring bar so that the steel plate is above the magnesium alloy plate; (2) driving the friction head to carry out rotary friction on the steel plate for 1-15 s, and generating heat so that the steel plate is softened; (3) downwardly pressing the friction head and extruding the steel plate, staying for 1-15 s on the depth when the lower surface of the friction head is downwardly pressed at the position which is 0.1-0.4 mm far away from the upper surface of the steel plate, and effectively removing oxides on the surface of the material through the top forging force of the friction head and thermoplastic flow of friction generated by the rotation friction between the friction head and the steel plate so that the steel-magnesium interface is clean; and (4) generating plastic deformation of the magnesium and steel contact surface by utilizing the top forging force and the rotary friction of the friction head so that the steel plate at the joint forms a stirring region and the magnesium alloy does not have an obvious stirring region, rising the friction head, completing welding, and obtaining a spot welded joint without a key hole.
Description
technical field [0001] The invention relates to friction stir welding in pressure welding, and the international patent classification is B23K20 / 12. Background technique [0002] Friction stir welding technology has many unique advantages. For the connection of light alloy materials (such as aluminum, copper, magnesium, zinc, etc.), it has incomparable advantages over other welding methods in terms of welding methods, mechanical properties and production efficiency. Friction stir welding is a solid phase connection method. The weld joint has excellent mechanical properties and small welding deformation. It does not need to add shielding gas and welding wire during the welding process, and there is no melting, smoke, splash and arc light. It is an environmentally friendly new connection technology. Due to the characteristics of light weight, high strength, pressure resistance, good heat dissipation, easy casting and injection molding, magnesium alloys are gradually replacing...
Claims
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IPC IPC(8): B23K20/12B23K20/22
Inventor 王希靖李博强张昌青张忠科
Owner LANZHOU UNIVERSITY OF TECHNOLOGY