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A kind of molybdenum/steel dissimilar metal laser welding method

A technology of dissimilar metals and welding methods, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve problems such as limited application range, limited joint size and form, slow welding speed, etc., to achieve reduced residual stress and no cracks Molybdenum side heat-affected zone, the effect of high-efficiency and high-quality welding

Active Publication Date: 2022-06-28
BAOJI UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology requires vacuum conditions during welding, and the welding speed is slow, and the size and form of the joint are limited, which greatly limits the scope of application

Method used

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  • A kind of molybdenum/steel dissimilar metal laser welding method
  • A kind of molybdenum/steel dissimilar metal laser welding method
  • A kind of molybdenum/steel dissimilar metal laser welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Preparation of activated element-doped three-dimensional network composite interlayer

[0032] The 0.1mm thick Ni foam and the 0.1mm thick Ni foil are laminated, and the local area is connected by laser spot welding to form the Ni skeleton; the activated element B powder is mixed into 50ml of ethanol, and the amount of B powder is the quality of the composite intermediate layer. 0.2% of the ions, ultrasonic stirring to disperse uniformly, the solution is evenly poured onto the Ni skeleton, air-dried or dried to form an activated element-doped three-dimensional network composite intermediate layer.

Embodiment 2

[0033] Example 2: Preparation of activated element-doped three-dimensional network composite interlayer

[0034] The 0.2mm thick Ni foam and the 0.2mm thick Ni foil are attached, and the local area is connected by laser spot welding to form the Ni skeleton; the activated element B powder is mixed into 80ml of ethanol, and the amount of B powder is the quality of the composite intermediate layer. 1%, ultrasonic stirring to disperse uniformly, the solution is evenly poured onto the Ni skeleton, air-dried or dried to form an activated element-doped three-dimensional network composite intermediate layer.

Embodiment 3

[0035] Example 3: Molybdenum / Steel Dissimilar Metal Laser Welding

[0036] In order to obtain high-quality molybdenum / steel dissimilar metal joints, pure Mo and 301 stainless steel are laser welded, and the size of pure Mo plate and 301 stainless steel plate is the same, 200mm (length) × 100mm (width) × 1mm (thickness). The 0.2mm thick activation element is doped into the three-dimensional network composite intermediate layer (prepared in Example 1, figure 1 ) is placed between the pure Mo plate and the 301 stainless steel plate, the welding material is clamped by a fixture, and the welding heat source is placed at the interface of the composite intermediate layer / steel, such as figure 2 shown. Welding is carried out in an argon protective atmosphere. The pulse laser welding process parameters are: laser power 800W, welding speed 1200mm / min, defocus amount 0mm, protective gas flow rate of 12L / min for the front and 10 / min for the back.

[0037] The resulting molybdenum / steel ...

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Abstract

The invention discloses a molybdenum / steel dissimilar metal laser welding method, which belongs to the field of dissimilar metal material welding technology. In the method, a three-dimensional network composite intermediate layer containing activated elements is added between the molybdenum material and the steel material as solder for welding the molybdenum and steel, and the welding is completed by using a high-energy beam laser melting and brazing method. The residual stress during welding can be reduced through the three-dimensional network geometry of the composite intermediate layer, the width of the embrittlement zone on the molybdenum side and the amount of Mo-Fe brittle intermetallic compounds can be reduced through laser welding and brazing technology, and the melting and brazing interface of molybdenum / steel joints can be changed by activating elements wettability and optimized Mo‑Fe brittle intermetallic morphology, resulting in crack-free joints with high tensile strengths up to 500 MPa.

Description

technical field [0001] The invention belongs to the field of metal material interface welding technology, and in particular relates to a dissimilar metal connection method of molybdenum material and steel material. Background technique [0002] Molybdenum and its alloys have excellent properties such as high melting point, fast thermal conductivity, low thermal expansion coefficient, good wear resistance and corrosion resistance, and are widely used in aerospace, military, nuclear power, chemical electronics and other industries. Stainless steel is an alloy with good processing performance and excellent comprehensive performance, which is widely used in nuclear power, machinery, petrochemical and other fields. The composite structure of stainless steel and molybdenum alloy can not only combine the advantages of the two materials, but also reduce the manufacturing cost. However, there are three main difficulties in the connection of molybdenum and steel: (1) molybdenum mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/005B23K1/19B23K1/20B23K3/08
CPCB23K1/0056B23K1/19B23K1/20B23K3/08
Inventor 高晓龙刘晶李涛余浩魁李伦坤李思阳王参军
Owner BAOJI UNIV OF ARTS & SCI
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