Double-way friction stir welding method for dissimilar material mismatching processing

A friction stir, dissimilar material technology, used in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of intermetallic compound welds, stirring head wear, poor weld formation, etc., to achieve simple processing and avoid friction Abrasion, not easy to wear effect

Active Publication Date: 2018-06-08
安徽万宇机械设备科技有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The invention provides a double-pass friction stir welding method for dissimilar material mismatching, aiming to solve the problems of stirring head wear and material sticking which are easy to occur in the friction stir welding process of dissimilar metals such as aluminum / steel, aluminum / copper, magnesium / copper, etc. Problems caused by poor weld formation, intermetallic compounds inside the weld, and defects inside the weld

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  • Double-way friction stir welding method for dissimilar material mismatching processing
  • Double-way friction stir welding method for dissimilar material mismatching processing
  • Double-way friction stir welding method for dissimilar material mismatching processing

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specific Embodiment approach 1

[0023] Specific implementation mode one: combine Figure 1 to Figure 6 Describe this implementation mode, this implementation mode is realized through the following steps:

[0024] Step 1. Pre-processing before welding: before welding, the first base material 3 and the second base material 4 to be welded are processed before welding by mechanical milling, and the upper end face of the first base material 3 close to the butt joint is milled Step 3-2, the depth d of the step 3-2 is 0.3 mm ~ 0.5 mm, the width a of the step 3-2 is 4 mm ~ 14 mm, and the butt surface is processed into a right slope 3 with a right angle β1 with the vertical direction -1, the butt joint surface of the second base material 4 is processed into a left slope 4-1 forming a left angle β2 with the vertical direction;

[0025] Step 2. Cleaning the base material: After milling, first use ultrasonic cleaning to clean the first base material 3 and the second base material 4 to remove milling debris, and then us...

specific Embodiment approach 2

[0030] Specific implementation mode two: combination Figure 3 ~ Figure 6 To describe this embodiment, in this embodiment, in Step 1, the first base material 3 is steel or copper, and the second base material 4 is aluminum alloy or magnesium alloy. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0031] Specific implementation mode three: combination image 3 and Figure 4 To describe this embodiment, in this embodiment, in Step 1, the original thickness b of the first base material 3 and the second base material 4 is 3 mm to 8 mm. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a double-way friction stir welding method for dissimilar material mismatching processing. The problems are solved that in the butt joint and friction stir welding process of dissimilar metal such as aluminum/steel, aluminum/copper and magnesium/copper, the situations easily exist that a stirring head is abraded, formation of welding seams is poor due to a material glued tothe stirring head, and the defects exist in intermetallic compounds in the welding seams and exist in the welding seams. The method comprises the steps that 1, two parent materials to be welded are preprocessed, the thickness of a welding area is subjected to differentiation, and a mismatching connector is formed; 2, firstly, the parent materials to be welded are subjected to ultrasonic cleaning and preprocessing, and then acetone is used for wiping the surfaces of the parent materials; 3, the two parent materials to be welded are clamped and located; 4, the stirring head with a large-sized shaft shoulder is shifted to the sides of the low-melting-point parent materials, a small quantity of high-melting-point parent materials are inserted in the stirring head, and first-time welding is conducted; 5, the stirring head is replaced by a small-sized stirring head, the small-sized stirring head is further shifted to the sides of the low-melting-point parent materials, second-time repair welding is conducted, and accordingly the good-quality connection between dissimilar materials is formed. The double-way friction stir welding method is applied to butt joint and friction stir welding ofthe dissimilar metal such as aluminum/steel, aluminum/copper and magnesium/copper.

Description

technical field [0001] The invention belongs to the field of friction stir welding, and in particular relates to a two-pass friction stir welding method for mismatching dissimilar materials. Background technique [0002] With the continuous development and transformation of structural manufacturing fields such as aerospace, automobiles and ships, the requirements for structural design are getting higher and higher. The connection structure of dissimilar materials can give full play to the comprehensive excellent properties of the two materials and meet the requirements of different working conditions for materials, so it has increasingly received extensive attention from related industries. However, due to the huge difference in physical and chemical properties of dissimilar materials, their weldability is poor, and it is difficult to achieve high-quality welding of dissimilar materials by traditional welding methods. Friction stir welding technology, as a new solid phase j...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/26
CPCB23K20/12B23K20/122B23K20/26
Inventor 刘鑫万龙吕宗亮黄体方树西
Owner 安徽万宇机械设备科技有限公司
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