Friction welding, plug welding and riveting combination spot welding method for light alloys and steel
A technology of light alloy and composite point, applied in the processing field of dissimilar metals, can solve problems such as unavoidable metallurgical problems of light alloys, and achieve the effects of reducing mechanical energy input of rivets, strengthening metallurgical reaction, and improving friction welding state.
Active Publication Date: 2020-02-11
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
However, resistance spot welding is essentially a fusion welding method, and it is difficult to avoid the metallurgical problems of light alloy and steel welding
Method used
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Embodiment Construction
[0016] as attached figure 1 As shown, the present invention provides a novel friction plug riveting compound spot welding method, and the joint mode used can be lap joint or lap joint.
[0017] 1. Fix the rivet on the special spot welding chuck, fix the light alloy and steel metal plate with special equipment, and prepare for welding;
[0018] 2. Start the welding switch button, and the rivet will move downward with the high-speed rotation of the chuck and feed downward at the same time. The rivet speed is 1000rpm-5000rpm. When the rivet is in contact with the upper light alloy, the light alloy reaches a thermoplastic state under the friction of the high-speed rotating rivet, and is continuously extruded along the periphery of the rivet. During this process, an auxiliary current can be passed to improve the flow behavior of the light alloy metal. The auxiliary current is 0-50A;
[0019] 3. When the upper part of the light alloy plate is completely penetrated by the rivet and...
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Abstract
The invention relates to the machining method of dissimilar metal, belongs to the related areas of material connection and fabrication, and particularly relates to a friction welding, plug welding andriveting combination spot welding method for light alloys and steel. The friction welding, plug welding and riveting combination spot welding method integrates three technical features of friction welding, plug welding and riveting, and can realize high-quality spot welding of the light alloys and the steel. For lapping or overlapping joints of the light alloys and the steel, a special driving mechanism is adopted to make special steel rivets rotate at a high speed and continue to be fed, when the rivets make contact with the light alloys, high-speed friction enables the light alloys to be ina thermoplastic state so that the rivets can be jammed into the light alloys, when the rivets are in contact with the steel, the end faces of the rivets rub against the steel at a high speed to formfriction welding, and finally spot welding of the light alloys and the steel is realized. In the welding process, auxiliary currents are introduced, on one hand, the metallurgical reaction at the circumferential interfaces between the light alloys and the rivets can be strengthened, the thermoplastic flow of light alloy metal can be improved, on the other hand, the friction welding state of the rivets and steel base materials can be improved, and the mechanical energy input of the rivets can be reduced.
Description
Technical field: [0001] The invention relates to a processing method of dissimilar metals, which belongs to the related field of material connection manufacturing, and in particular to a friction plug-riveting compound spot welding method of light alloy and steel. Background technique: [0002] With the development of modern manufacturing in the direction of lightweight, multi-functional and structural-functional integration, the mixed use of multiple materials has become one of the main ideas in the design of industrial structures such as aviation, aerospace and automobiles. In many structural parts, in order to meet the requirements of structural performance and lightweight at the same time, light alloys (including aluminum alloys, magnesium alloys, aluminum-lithium alloys, etc.) are often partially replaced by steel to manufacture light alloy / steel composite structures. The welding of light alloy and steel is one of the key technologies for manufacturing this composite st...
Claims
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Login to View More IPC IPC(8): B23K28/02
CPCB23K28/02
Inventor 陈树海李建宇黄继华杨健
Owner UNIV OF SCI & TECH BEIJING