Cu/INVAR/Ni composite brazing filler metal for heterogeneous connection of hard alloy and steel and laser welding and brazing process thereof

A technology of cemented carbide and composite solder, which is applied in the direction of welding/cutting media/materials, metal processing equipment, welding media, etc., can solve the problems of excessive heat input and cracks due to differences in physical properties, and reduce welding heat input, The effect of solving cracks
CN113634839APending Publication Date: 2021-11-12SHANGHAI UNIV OF ENG SCI
4 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI UNIV OF ENG SCI
Publication Date
2021-11-12

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses Cu / INVAR / Ni composite brazing filler metal for heterogeneous connection of hard alloy and steel and a laser welding and brazing process thereof, and belongs to the technical field of laser brazing. The Cu / INVAR / Ni composite brazing filler metal is of a sandwich sheet structure composed of a Cu foil, an INVAR sheet and an Ni foil, the Cu foil is arranged on one side of steel in advance, the Ni foil is arranged on one side of hard alloy in advance, the INVAR sheet is located between the Cu foil and the Ni foil, the thickness of the Cu foil is consistent with that of the Ni foil, the thickness of the INVAR sheet is larger than that of the Cu foil and that of the Ni foil, and laser welding and brazing is conducted through an automatic platform based on a laser, a robot and an outer shaft positioner. According to the Cu / INVAR / Ni composite brazing filler metal and the laser welding and brazing process thereof, the stress between the hard alloy and the steel with overlarge difference of physical properties such as thermal expansion coefficients is buffered, the welding heat input is reduced, and the problem of cracks caused by overlarge heat input in laser welding of the hard alloy and the steel is solved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of laser brazing, and in particular relates to a Cu / INVAR / Ni composite solder used for heterogeneous connection of cemented carbide and steel and a laser melting and brazing process thereof. Background technique

[0002] Cemented carbide has the characteristics of high hardness, excellent wear resistance, and stable chemical properties. It is an ideal material for making knives. However, due to the high brittleness of cemented carbide, it is easy to break, and the tool with the cemented carbide tip embedded in the steel matrix can reduce the disadvantages of poor toughness and brittleness. The connection between cemented carbide and steel is usually brazed. However, due to the large difference in thermal physical properties such as linear expansion coefficient, thermal conductivity, and melting point between cemented carbide and steel, eutectic structures are prone to appear during welding, and brittle phase...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More