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Stir friction composite welding stainless steel device with resistor heat and method thereof

A technology of friction stir and composite welding, which is applied in the field of friction stir welding stainless steel equipment, resistance heat-friction stir composite welding stainless steel equipment, which can solve the problems of embrittlement of joints, high heat loss, long heating time, etc., and achieve increased Welding length, extended service life, easy-to-achieve effects

Inactive Publication Date: 2011-09-07
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many problems when welding stainless steel by traditional fusion welding process: for example, austenitic stainless steel is easy to form columnar crystals with strong direction, which is conducive to the segregation of impurities and solidification cracks; The grains of the element body are easy to grow, resulting in embrittlement of the joint; martensitic stainless steel is easy to form cold cracks, etc.
For example, laser is used as an auxiliary heat source, the surface of the workpiece reflects its energy more seriously, and the heat loss is more; the device structure of the plasma and arc auxiliary heat source is complex and expensive; Efficiency of friction welding

Method used

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  • Stir friction composite welding stainless steel device with resistor heat and method thereof
  • Stir friction composite welding stainless steel device with resistor heat and method thereof

Examples

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Effect test

specific Embodiment 1

[0021] Weld 3mm thick 316 stainless steel, the stirring head is tungsten alloy steel, the shaft shoulder diameter is 16mm, the stirring pin diameter is 5mm, and the length is 2.9mm. Using the resistance heating-friction stir composite welding process of the present invention, the rotation speed of the stirring head is 950r / min, the welding speed is 60mm / min, and the auxiliary current is 1000A. The welding length is 150mm, the tensile strength of the welded stainless steel welded joint reaches 86% of the base metal, and the wear of the stirring head is relatively light.

[0022] In the absence of an auxiliary heat source, friction stir welding cannot form an effective connection, and the stirring head is severely worn.

specific Embodiment 2

[0023]Weld 3mm thick 304 stainless steel, the stirring head is tungsten alloy steel, the shaft shoulder diameter is 16mm, the stirring pin diameter is 5mm, and the length is 2.9mm. The resistance heat-friction stir composite welding stainless steel device of the present invention is used for welding, the rotation speed of the stirring head is 950r / min, the welding speed is 60mm / min, the auxiliary current is 1000A, and the welding length is 142mm. The tensile strength of the stainless steel welded joint after welding reaches 85% of the base metal, and the wear of the stirring head is relatively light.

[0024] In the absence of an auxiliary heat source, friction stir welding cannot form an effective connection, and the stirring head is severely worn.

[0025] It can be seen from the above examples that using the device of the present invention to weld stainless steel can effectively reduce the difficulty of friction stir welding of stainless steel. At the same time, it reduces...

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Abstract

The invention discloses a device for welding stainless steel by resistance heat as well as stirring and friction, comprising an electric power source, a transformer and a stirring head, wherein, two output terminals of the electric power source are connected with the input terminal of the transformer by an electric cable, one output terminal of the transformer is connected with a cushion plate by the electric cable, the cushion plate is used for placing work pieces, the other output terminal of the transformer is connected with an electric brush by the electric cable, the electric brush is contacted with a copper ring arranged in a groove at the upper end of the stirring head. When the device of the invention is adopted for welding, the transformer is adjusted to form low voltage heavy current; driven by an electric motor, a mixing needle is screwed in the space between two work pieces, a low voltage heavy current circuit is conducted and generates relatively high resistance heat on the work pieces, materials at the welding lines are plasticized under high temperature effect of the resistance heat and friction heat, and welding lines form at the rear part of the mixing needle. Stirring friction welding of stainless steel can be realized, abrasion of the stirring head can be reduced, weld length of the stirring head can be increased, service life of the stirring head can be prolonged; in addition, the device of the invention has simple structure and relatively low cost, and is easy to manufacture.

Description

technical field [0001] The invention belongs to the field of metal welding, and relates to a device and method for friction stir welding stainless steel, in particular to a device and method for resistance heat-friction stir composite welding stainless steel. Background technique [0002] As an important material in modern industry, stainless steel has many excellent characteristics such as high strength, corrosion resistance, and easy processing, and is widely used in industries such as ships, vehicles, automobiles, and home appliances. In stainless steel processing technology, welding has become an essential processing technology. At present, there are many problems when welding stainless steel by traditional fusion welding process: for example, austenitic stainless steel is easy to form columnar crystals with strong direction, which is conducive to the segregation of impurities and solidification cracks; The ferrite grains are easy to grow, resulting in embrittlement of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12
Inventor 王快社王文郭韡王文礼
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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