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Light metal and bare steel plate spot-welding method based on bulk forming solder

A metal plate and light metal technology, applied in the field of optimizing dissimilar metal spot welding, can solve the problems of joint deformation, bare steel plate cannot be connected with light metal materials to obtain good joints, reduce vehicle body design and manufacturing costs, achieve less welding defects, and be easy to promote Application, effect of improving wettability

Active Publication Date: 2011-07-20
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the above-mentioned deficiencies existing in the prior art, and provides a spot welding method for light metal and bare steel plate based on volume-forming solder, using cold metal transitional arc welding to form a spot-melt brazing joint between the light metal and the bare steel plate to realize light metal welding. The point connection with steel, while ensuring the connection quality of dissimilar metals, solves the problem of severe deformation of the joint caused by continuous seam welding and the inability of bare steel plate to be connected with light metal materials to obtain a good joint. The joint design of the main body parts does not affect, thereby greatly reducing the design and manufacturing costs of the body

Method used

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  • Light metal and bare steel plate spot-welding method based on bulk forming solder
  • Light metal and bare steel plate spot-welding method based on bulk forming solder
  • Light metal and bare steel plate spot-welding method based on bulk forming solder

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Embodiment 1

[0032] Such as figure 1 , 2 , 3, and 4, this embodiment includes a solder shaping and embedding device and an arc welding system.

[0033] The solder shaping and embedding device includes: a punch 1 , an upper die 2 , a blank holder 3 , and a lower die 4 . Among them: the punch 1 is fixedly connected with the upper die 2 and sleeved in the blank holder 3, the perforated light metal plate 5 and the solder 6 are placed on the lower die 4, the punch 1, the upper die 2, the blank holder 3 and the The lower mold 4 is set coaxially.

[0034] The punch 1 provides downward pressure during the extruding process of the brazing filler metal 6 , and is threaded inside so as to be connected with the upper die 2 .

[0035] The end of the upper die 2 is fixedly connected to the punch 1 through threads, and in the extrusion molding process of the solder 6, forms a cavity with the lower die 4 and the perforated light metal plate 5, so that the extruded solder 6 Fill the inside of the cavit...

Embodiment 2

[0053] The upper light metal plate 5 of this embodiment is aluminum alloy AA6061-T6, the lower bare steel plate 12 is high-strength steel DP780, the thickness of the plate is matched: 1mm+2mm, the hole diameter is 6.5mm, the center distance between the holes is 20mm, aluminum The alloy plate 5 is mechanically polished to remove the oxide layer on the surface, and acetone reagent is used to remove the oil stain on the surface of the metal plate.

[0054] Process parameters: The material of welding wire 2 is A1Si5, the diameter is 1.2mm, the welding current is 144A, the voltage is 16.4V, the wire feeding speed is 6.5m / min, the arc length is corrected to -30%, the wire withdrawal frequency is 70Hz, and argon is used as protection Gas, the flow rate is 15L / min, and the welding time is 0.8s.

[0055] The working process of this embodiment is as follows: Figure 5 (a)~(f) and Figure 6 (a) ~ (h) as shown:

[0056] The first step, welding material pretreatment: after drilling a nu...

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Abstract

The invention relates to a light metal and bare steel plate spot-welding method based on a bulk forming solder in the technical field of metal welding. The method comprises the following steps of: drilling a technology hole on a light metal plate, shaping the solder and embedding the solder into the technology hole; overlapping and clamping the light metal plate provided with the hole and the solder on a bare steel plate, and making a welding gun with a welding wire vertical to the metal plate and aligned with the center of the technology hole; and introducing protective gas into a position to be welded in advance, igniting electric arcs in a cold metal transfer (CMT) mode, combusting, filling a space between the technology hole and the solder, melting the boundary of the solder and the hole, and brazing with the lower-layer steel plate through the solder to form a melt-brazed joint. By adopting cold metal transfer arc welding, the spot melt-brazed joint is formed between the light metal and the bare steel plate, spot connection is realized between the light metal and steel, the differential metal connecting quality is ensured and the manufacturing cost of vehicle bodies is greatly reduced.

Description

technical field [0001] The invention relates to a method in the technical field of metal welding, in particular to an optimized dissimilar metal spot welding method between light metal and bare steel plate. Background technique [0002] Because the density of light metal materials such as aluminum and magnesium is much lower than that of steel, they are favored by major automobile manufacturers. However, the overall mechanical properties of advanced steel are still better than light metal materials. Therefore, the multi-material connection structure of light metal and advanced high-strength steel has become an automobile The preferred solution for lightweighting, which involves a heterogeneous connection between light metal and steel. [0003] Because of the huge difference in melting point, thermal expansion coefficient and electrical conductivity between light metal and steel, and the formation of hard and brittle phases - intermetallic compounds during welding, it is diff...

Claims

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Application Information

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IPC IPC(8): B23K9/007B23K9/28B23K9/235B23K103/18
Inventor 林忠钦李永兵王培中雷海洋来新民陈关龙
Owner SHANGHAI JIAO TONG UNIV
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