Lap-joint solder-free friction-stir direct solid-phase crimping method

A friction stir, lap joint technology, used in welding/welding/cutting items, welding equipment, non-electric welding equipment, etc., can solve problems such as difficulty, interface oxide film dispersion and poor vertical mixing, needle wear and breakage, etc. Achieve the effect of increasing productivity, reducing costs, and simplifying processes

Inactive Publication Date: 2016-06-08
XI AN JIAOTONG UNIV
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Problems solved by technology

However, aluminum / steel lap friction stir welding is more difficult than aluminum / steel butt friction stir welding, mainly in: interface oxide film dispersion and vertical mixing poor; pin wear and fracture; Interface micropores caused by different flow stresses; the single-pass welding area is limited by the diameter of the needle (generally about 5mm) and is very small

Method used

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  • Lap-joint solder-free friction-stir direct solid-phase crimping method
  • Lap-joint solder-free friction-stir direct solid-phase crimping method
  • Lap-joint solder-free friction-stir direct solid-phase crimping method

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experiment example

[0036] The present invention involves two methods in terms of stirring tool alignment, one, as figure 1 (b) method, align the shoulder edge of the stirring tool with the outer edge of the aluminum plate; figure 1 (a) method, cover the edge of the aluminum plate with the shoulder of the stirring tool. The difference between these two methods is that compared with the alignment method used in method 2, in method 1, there are more aluminum base materials under the stirring tool shoulder under the stirring friction. Therefore, in the welding process, a large amount of aluminum material is extruded out of the stirring tool shoulder after softening, that is, the weld bead widening effect is obvious; and in method 2, a small amount of widening aluminum material covers the lower part of the stirring tool shoulder, and this part of the widening aluminum material is affected. The strong interface torsion and forging effects are beneficial to the mechanical membrane breaking effect and ...

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Abstract

The invention provides a direct lap joint type phase solidifying pressure welding method without brazing filler metal stirring friction. Under the situation that a needle and brazing filler metal do not exist, the tool torsion function is intensified by lowering edge restraining of an upper plate (an aluminum product), a weld pass is arranged on the edge, a stir-welding head shoulder completely covers the edge of the upper plate, the upper plate edge squashing deformation and widening deformation are maximized, membrane bursting and pressing are achieved in a priority mode, the torsion function of the surface of a lower plate (steel) becomes large when the torsion deformation at the edge of the aluminum product becomes large, and membrane bursting and weld pass widening are facilitated.

Description

technical field [0001] The invention relates to the technical field of friction-stir direct crimping, in particular to an overlap-type direct solid-phase crimping method without brazing filler metal stirring and friction. Background technique [0002] The tools used in friction stir welding (FSW: frictionstirwelding) are not only heat sources but also force sources for the workpieces to be welded. Especially in the welding of lap joints, the importance of tools as a force source to achieve interface film removal and close contact is more prominent, and its potential needs to be further explored. During the friction stir welding process of lap joints, the mechanical effects of the tool on the workpiece mainly include forging and torsion. The main influencing factors of forging action are tool inclination angle and welding speed. There are relatively few studies on the influence of factors affecting torsional action. These factors should include rotational speed, distance fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12
CPCB23K20/122B23K20/2275B23K20/24B23K2101/18B23K2103/04B23K2103/10
Inventor 张贵锋郝海张林杰张建勋
Owner XI AN JIAOTONG UNIV
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