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A semi-solid friction brazing method for dissimilar metals based on high frequency assistance

A dissimilar metal, high-frequency assisted technology, used in metal processing equipment, welding equipment, non-electric welding equipment, etc., can solve the problems of limited design range of stud head structure, thick intermetallic compound layer, affecting the overall performance of joints, etc. The effect of improving bending resistance and fatigue resistance, simple layout and high comprehensive performance

Active Publication Date: 2021-07-23
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can realize stud welding of dissimilar metal materials, and solves the problem of insufficient welding heat by combining friction and arc composite heat sources. However, due to the high requirements for welding equipment in this method, high current auxiliary welding is required, and the joint interface is prone to appear thicker The intermetallic compound layer, which affects the overall performance of the joint
At the same time, due to the need for stud head arc ignition, the design range of the stud head structure is limited, which reduces the mosaic effect of the stud

Method used

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  • A semi-solid friction brazing method for dissimilar metals based on high frequency assistance
  • A semi-solid friction brazing method for dissimilar metals based on high frequency assistance
  • A semi-solid friction brazing method for dissimilar metals based on high frequency assistance

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Effect test

Embodiment 1

[0043] Embodiment 1, a method for semi-solid friction brazing of dissimilar metals based on high frequency assistance, which includes the following steps.

[0044] Step 1, prepare steel studs to be welded and aluminum alloy workpieces to be welded, see Figure 5 , the welding end of the stud to be welded is processed into a tapered step shape: the welding end is in the shape of a conical column with a taper angle of 10° as a whole, and 5 steps are respectively arranged in the direction of the stud to be welded from its end face, and the diameter of 5 steps is Decreases away from the shaft. The shape of the workpiece to be welded is a thick plate, and a preset hole is processed at the surface of the workpiece to be welded. The preset hole is in the shape of a truncated cone. The solder is placed on the inner wall of the preset hole of the workpiece to be welded. see Figure 9 , the inner wall ring of the preset hole of the workpiece to be welded is provided with two protrusi...

Embodiment 2

[0049] Embodiment 2, a method for semi-solid friction brazing of dissimilar metals based on high frequency assistance, which includes the following steps.

[0050] Step 1, prepare steel studs to be welded and copper workpieces to be welded, see Figure 7 , the welding end of the stud to be welded is processed into a tapered thread shape, and the welding end is in the shape of a conical column with a taper angle of 10° as a whole, and its outer peripheral surface is provided with a spirally arranged thread groove. mm, the pitch is 1.5mm. Preset holes are processed at the surface of the workpiece to be welded, the preset hole is in the shape of a truncated cone, and the angle of its generatrix is ​​the same as the single taper of the welding end of the stud to be welded, and the Zn-Al15 solder is placed on the preset hole of the workpiece to be welded. inner wall of the hole. see Figure 10 , the Zn-Al15 solder is attached to the inner wall of the preset hole of the workpiece...

Embodiment 3

[0055] Embodiment 3, a method for semi-solid friction brazing of dissimilar metals based on high-frequency assistance, which includes the following steps:

[0056] Step 1, prepare copper studs to be welded and aluminum alloy workpieces to be welded, see image 3 , the welding end of the stud to be welded is processed into a tapered step thread shape, and the welding end is in the shape of a conical column with a taper angle of 10° as a whole. There are 10 steps from the end face to the direction of the stud to be welded. The 10 steps The diameter of the steps decreases from the direction away from the rod, and the outer peripheral surface of the welding end is processed with double helical grooves. The double helical grooves start from the second step near the root step, and the starting angles are 0° and 180° respectively. The depth is 1mm and the pitch is 1mm. Preset holes are processed at the surface of the workpiece to be welded, the preset hole is in the shape of a trunc...

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Abstract

The invention discloses a semi-solid friction brazing method for dissimilar metals based on high-frequency assistance, which includes the following steps: step 1, preparing a stud to be welded and a workpiece to be welded, and the welding end of the stud to be welded is processed into a tapered step shape, taper thread shape or taper step thread shape, the workpiece to be welded is processed with a preset hole, and the solder is placed on the inner wall of the preset hole of the workpiece to be welded. Step 2, using a high frequency induction coil to Heating the welding end of the welding stud to 300-500°C and keeping it warm for 1-5 minutes; step 3, the friction stage, rubbing at a speed of 600-1500r / min and a friction pressure of 10-40MPa for 3-8s; step 4, the upsetting stage, friction rotation Emergency stop, the emergency stop time is less than 0.5s, the upsetting pressure is 15-60MPa, the upsetting time is 3-10s, and the displacement of the stud to be welded during the upsetting stage is 1-3mm. Step 5: After upsetting, hold the load under a pressure of 15-60 MPa for 10-25 seconds, and then air-cool to room temperature. It can realize the high-quality connection of dissimilar metals, has the dual advantages of "metallurgical bonding + mechanical occlusion", and improves the mechanical properties and welding efficiency of the joint.

Description

technical field [0001] The invention relates to a stud friction welding method, in particular to a high-frequency-assisted semi-solid friction brazing method for dissimilar metals. Background technique [0002] Dissimilar metal composite structures have very bright application prospects in industries such as automobiles, aircraft, and weaponry due to their light weight, high comprehensive performance, and the combination of "light + strong" composite structures. However, there are huge physical and chemical properties between the two. There are still many practical problems in the welding of dissimilar metal materials. Nowadays, the development of welding technology for dissimilar metal composite components lags behind the development of other forming techniques to a large extent, and has become a bottleneck for the practical application of the pair of dissimilar metals. Therefore, it is very necessary to deeply analyze and study the scientific problems of the connection of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K20/22B23K20/24
CPCB23K20/128B23K20/1295B23K20/22B23K20/24
Inventor 许惠斌丛伟钟万亮
Owner CHONGQING UNIV OF TECH
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