Connection method for improving strength of overlap joints

A connection method and lap joint technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of reduced strength coefficient of aluminum alloy lap welded joints, large changes in welding parameters, slag inclusions and pores, etc. Achieve the effect of increasing the bearing area of ​​the weld, increasing the bearing load, and changing the stress state of the weld

Inactive Publication Date: 2015-08-26
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Lap welding is the welding of lap joints, that is, the welding of the joints of two separate workpieces (upper plate and lower plate) together (not together). Aluminum alloy lap welding is due to the existence of its lap interface. It is easy to oxidize during the welding process, resulting in problems such as slag inclusions and pores. At the same time, there are many changes in welding parameters during lap welding, which will lead to a decrease in the strength coefficient of the aluminum alloy lap welding joint.

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  • Connection method for improving strength of overlap joints
  • Connection method for improving strength of overlap joints

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Embodiment 1

[0023] In this embodiment, the plate to be welded is A356 aluminum alloy, the size of the welded plate is 215mm×175mm×4mm, and the overlapping distance d is 25mm, as figure 2 shown. The metal inert gas shielded welding method is adopted, the filler material is ER4043 welding wire, the shielding gas is pure argon, the welding current is 130A, and the welding speed is 0.9m / min. Finally, the welding of the entire lap edge is completed by a robot.

[0024] In the first step, according to the overlapping distance d and the size of the overlapping plate, a plurality of rectangular notches 11 are processed on the overlapping edge of the overlapping upper plate 1 before welding, and processed into figure 1 , 2 In the sample shown, the number of processed rectangular notches 11 is 3, of which figure 2 The dimensions indicated are not intended to be limiting. Specifically: the width a of the rectangular notch 11 is 15mm, the length b of the rectangular notch 11 is 25mm, the distanc...

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Abstract

The invention relates to the technical field of welding, in particular to a connection method for improving the strength of overlap joints. The connection method is suitable for the welding process of various aluminum alloy overlap joints with the overlap jointing distance larger than or equal to 20 mm. The connection method for improving the strength of overlap joints includes the following steps that a, a plurality of rectangular notches are machined in the overlap joint edge of an upper overlap joint plate before welding; b, welding is conducted along the edge of a lap weld according to a conventional welding method. Compared with the prior art, the connection method for improving the strength of overlap joints has the advantages that the stress condition of welding seams is changed by enlarging the bearing area of the welding seams, so that the bearing load of the welding seams is improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a connection method for improving the strength of lap joints, which is applicable to the welding process of lap joints of various aluminum alloys and the lap distance is not less than 20 mm. Background technique [0002] The energy problem is becoming more and more serious, making reducing the weight of the car and reducing fuel consumption become the key for major car manufacturers to improve their competitiveness. According to reports, for every 50kg reduction in vehicle weight, the distance traveled per liter of fuel can increase by 2km. The density of aluminum alloy is about one-third of that of steel. It has good corrosion resistance and good plasticity. It can be processed by casting, forging, stamping and other processes. Therefore, more and more aluminum alloys are used in automobiles to replace steel and reduce vehicle weight. Heavy, thereby reducing fuel consumption. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/167
CPCB23K9/173B23K9/167B23K2101/185
Inventor 崔海超芦凤桂唐新华刘文
Owner SHANGHAI JIAO TONG UNIV
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