Molybdenum/steel dissimilar metal laser melt-brazing welding method

A technology of dissimilar metals and welding methods, applied in welding equipment, metal processing equipment, auxiliary equipment, etc., can solve the problems of limited size and form of joints, limited application range, slow welding speed, etc., and achieve no thermal influence on the molybdenum side of cracks zone, reduce residual stress, high-efficiency and high-quality welding effect

Active Publication Date: 2021-06-29
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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  • Molybdenum/steel dissimilar metal laser melt-brazing welding method
  • Molybdenum/steel dissimilar metal laser melt-brazing welding method
  • Molybdenum/steel dissimilar metal laser melt-brazing welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0032] Lay 0.1mm-thick foam Ni and 0.1mm-thick Ni foil, and connect local areas with laser spot welding to form a Ni skeleton; mix activated element B powder into 50ml of ethanol, and the amount of B powder is the mass of the composite middle layer 0.2% of the solution is uniformly dispersed by ultrasonic stirring, and the solution is evenly poured onto the Ni skeleton, and dried or dried to form an activated element-doped three-dimensional network composite middle layer.

Embodiment 2

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

[0034] Lay 0.2mm-thick foam Ni and 0.2mm-thick Ni foil, and connect local areas with laser spot welding to form a Ni skeleton; mix activated element B powder into 80ml ethanol, and the amount of B powder is the mass of the composite middle layer 1%, ultrasonically stirred to disperse evenly, the solution was evenly poured onto the Ni skeleton, and dried or dried to form an activated element-doped three-dimensional network composite middle 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. The pure Mo plate is the same size as the 301 stainless steel plate, which is 200mm (length) × 100mm (width) × 1mm (thickness). The 0.2mm thick activating element is doped with a three-dimensional network composite middle layer (prepared in Example 1, figure 1 ) placed between the pure Mo plate and the 301 stainless steel plate, the welding consumables are clamped by the fixture, and the welding heat source is placed at the composite intermediate layer / steel interface, such as figure 2 shown. Welding is performed under an argon protective atmosphere. Among them, 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 / ...

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Abstract

The invention discloses a molybdenum/steel dissimilar metal laser melt-brazing welding method, and belongs to the field of dissimilar metal material welding processes. According to the method, a three-dimensional network composite middle layer containing activating elements is added between a molybdenum material and a steel material to serve as welding flux for welding molybdenum and steel, and welding is completed through a high-energy beam laser melt-brazing method. The residual stress during welding is reduced through a three-dimensional network geometric structure of the composite middle layer, the width of a molybdenum side embrittlement region and the number of Mo-Fe brittle intermetallic compounds are reduced through the laser melt-brazing technology, the wettability of a molybdenum/steel joint melt-brazing interface is changed and the form of the Mo-Fe brittle intermetallic compounds is optimized through activating elements, and an obtained joint is free of cracks, and the tensile strength reaches 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 method for connecting dissimilar metals between 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 between molybdenum and steel: (1) m...

Claims

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Application Information

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Patent Type & Authority Applications(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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