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Braze welding method for hard alloy and low-alloy and high-strength steel

A low-alloy, high-strength, hard alloy technology, applied in welding media, welding equipment, metal processing equipment, etc., to achieve improved weldment performance, good mechanical properties, and good mechanical properties

Active Publication Date: 2013-05-01
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Technical problem: the purpose of this invention is to provide a kind of brazing method of cemented carbide and low-alloy high-strength steel, solve the problem of welding cemented carbide on the surface of low-alloy high-strength steel, to improve the mechanical properties of the surface of low-alloy high-strength steel performance problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: The first group adopts powder metallurgy method to prepare WC (80.0%~82.0%), Co (16.0%~18.0%), Ni (1.20%~1.50%), Cr (0.20%~0.30%) ), Nb (0.10%~0.20%) cemented carbide. A method for brazing the cemented carbide on the surface of the low-alloy high-strength steel substrate by using the KSL-1100X box-type furnace:

[0021] The specific implementation steps are as follows:

[0022] a. The type of low-alloy high-strength steel selected in this example is Q345, and the prepared cemented carbide is used for the test.

[0023] b. For low alloy high strength steel Q345 containing chemical mass percentage C≤0.20%, Mn(1.00%~1.60%), Si≤0.55%, S≤0.045%, P≤0.045%, V(0.02%~0.15%) , Nb (0.015%~0.060%), Ti (0.02%~0.20%). The cemented carbide YG20C contains chemical mass percentage WC (80.0%~82.0%), Co (16.0%~18.0%), Ni (1.20%~1.50%), Cr (0.20%~0.30%), Nb (0.10%~ 0.20%). Brass manganese brass flake brazing filler metal, its composition is: Cu (57.0%~58.0%), Mn (3.7%~4.3%)...

Embodiment 2

[0030] Example 2: The second group adopts powder metallurgy method to prepare WC (80.0%~82.0%), Co (16.0%~18.0%), Ni (1.20%~1.50%), Cr (0.20%~0.30%) ), Nb (0.10%~0.20%) cemented carbide. A method for brazing the cemented carbide on the surface of the low-alloy high-strength steel substrate by using the KSL-1100X box-type furnace:

[0031] The specific implementation steps are as follows:

[0032] a. The type of low-alloy high-strength steel selected in this example is Q345, and the prepared cemented carbide is used for the test.

[0033]b. For low alloy high strength steel Q345 containing chemical mass percentage C≤0.20%, Mn(1.00%~1.60%), Si≤0.55%, S≤0.045%, P≤0.045%, V(0.02%~0.15%) , Nb (0.015%~0.060%), Ti (0.02%~0.20%). The cemented carbide YG20C contains chemical mass percentage WC (80.0%~82.0%), Co (16.0%~18.0%), Ni (1.20%~1.50%), Cr (0.20%~0.30%), Nb (0.10%~ 0.20%). Brass manganese brass flake brazing filler metal, its composition is: Cu (57.0%~58.0%), Mn (3.7%~4.3%)...

Embodiment 3

[0040] Example 3: The third group adopts powder metallurgy method to prepare WC (80.0%~82.0%), Co (16.0%~18.0%), Ni (1.20%~1.50%), Cr (0.20%~0.30%) ), Nb (0.10%~0.20%) cemented carbide. A method for brazing the cemented carbide on the surface of the low-alloy high-strength steel substrate by using the KSL-1100X box-type furnace:

[0041] The specific implementation steps are as follows:

[0042] a. The type of low-alloy high-strength steel selected in this example is Q345, and the prepared cemented carbide is used for the test.

[0043] b. For low alloy high strength steel Q345 containing chemical mass percentage C≤0.20%, Mn(1.00%~1.60%), Si≤0.55%, S≤0.045%, P≤0.045%, V(0.02%~0.15%) , Nb (0.015%~0.060%), Ti (0.02%~0.20%). The cemented carbide YG20C contains chemical mass percentage WC (80.0%~82.0%), Co (16.0%~18.0%), Ni (1.20%~1.50%), Cr (0.20%~0.30%), Nb (0.10%~ 0.20%). Brass manganese brass flake brazing filler metal, its composition is: Cu (57.0%~58.0%), Mn (3.7%~4.3%)...

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Abstract

The invention discloses a braze welding process for a hard alloy and low-alloy and high-strength steel, which belongs to a braze welding method for high-strength base steel. The method comprises the following steps of: preparing the low-alloy and high-strength steel, the hard alloy and a manganese brass flaky brazing filler metal qualified in raw material inspection; removing oxide layers on the surfaces of the low-alloy and high-strength steel, the hard alloy and the manganese brass flaky brazing filler metal with sand paper; coating a soldering flux QJ-302 on the two faces of the brazing filler metal; placing the brazing filler metal between the low-alloy and high-strength steel and the hard alloy; fixing by using a clamp; placing into a KSL-1100X box type furnace; setting the heating speed at 10 DEG C per minute; heating till the solidus temperature of the brazing filler metal is 909 DEG C, and preserving heat for 30 minutes; setting a heating speed at 9 DEG C per minute; heating to 960 DEG C, and preserving heat for 10 minutes; cooling to 300 DEG C, and preserving heat for 30 minutes; and performing furnace cooling to the room temperature to obtain a weldment. The hard alloy is welded on the surface of the low-alloy and high-strength steel, so that the surface hardness and wear resistance of the low-alloy and high-strength steel can be enhanced, the mechanical property and mechanical performance are improved, and the application fields of the low-alloy and high-strength steel and the hard alloy are expanded.

Description

technical field [0001] The invention relates to a brazing method for high-strength steel base, in particular to a brazing method for hard alloy and low-alloy high-strength steel. Background technique [0002] Welding technology is mainly applied to metal base materials. There are more than 40 metal welding methods, which are mainly divided into three categories: fusion welding, pressure welding and brazing. Commonly used welding methods are arc welding, argon arc welding, CO 2 Shielded welding, oxygen-acetylene welding, laser welding and electroslag pressure welding, etc. the [0003] Fusion welding is a method in which the workpiece interface is heated to a molten state during the welding process and the welding is completed without pressure. During fusion welding, the heat source will rapidly heat and melt the interface between the two workpieces to be welded to form a molten pool. The molten pool moves forward with the heat source, and forms a continuous weld after co...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K35/40B23K1/20
Inventor 隋艳伟孙智吕扬李毅王瑞
Owner CHINA UNIV OF MINING & TECH
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