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Gas metal arc welding process of medium-manganese wear-resistant steel and Q345B low-alloy steel

A Q345B, molten electrode gas technology, used in metal processing equipment, manufacturing tools, welding equipment, etc., to save construction costs, reduce welding difficulty, and improve welding efficiency.

Active Publication Date: 2016-02-24
TIANJIN WILL LONG SCI &TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The problem to be solved by the present invention is to provide a gas shielded welding process for medium manganese wear-resistant steel and Q345B low alloy steel, so as to solve the problem in the prior art that the weldment still needs to be preheated before welding

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  • Gas metal arc welding process of medium-manganese wear-resistant steel and Q345B low-alloy steel
  • Gas metal arc welding process of medium-manganese wear-resistant steel and Q345B low-alloy steel
  • Gas metal arc welding process of medium-manganese wear-resistant steel and Q345B low-alloy steel

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Embodiment Construction

[0022] Embodiments The base metal is BTW1 medium manganese wear-resistant steel and Q345B low-alloy steel as examples, and the welding material is φ1.2mm welding wire, and its chemical composition and weight percentage are: C: 0.05-0.12%, Mn: 6.00-8.00% , P≤0.02%, S≤0.02%, Si: 0.70-1.00%, Cr: 17.00-19.00%, Mo≤0.10%, V≤0.10%, and the rest are iron and unavoidable impurities. The mechanical properties of BTW1 base metal are shown in Table 1.

[0023] Table 1 Mechanical properties of BTW1 medium manganese wear-resistant steel

[0024]

[0025] 1. The welding process parameters of BTW1 medium manganese wear-resistant steel and Q345B low alloy steel are as follows:

[0026] Double V-shaped grooves are made at the welded joints of BTW1 medium manganese wear-resistant steel and Q345B low-alloy steel base material, the opening angle is 60°, the groove depth is 18mm, and the gap at the root of the groove is 2-4mm after assembly; the selected protection The gas is Ar+5%CO 2 Mixed ...

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Abstract

The invention creatively provides a gas metal arc welding process of medium-manganese wear-resistant steel and Q345B low-alloy steel. The process is characterized in that the welding current, welding voltage, welding speed and interpass temperature are optimized, and proper protecting gas and gas flow rate are selected, and the tensile strength of an obtained welded joint is more than 470MPa; the tensile failure occurs at the Q345B low-alloy steel side; the impact energy Akv of a welding seam is more than 100J; the welded joint is qualified in a bending test in which the bending diameter is 8d and a bending center angle is 180 degrees. Compared with a traditional welding process, the gas metal arc welding process has the advantages that a base material is free of preheating treatment before welding, and the welding seam is free of stress relief annealing treatment after welding, so that the construction cost can be saved, the welding efficiency can be improved, the welding difficulty is reduced, and the industrial popularization can be conveniently carried out for a construction site.

Description

technical field [0001] The invention belongs to the field of metal shielded gas shielded welding welding technology for wear-resistant steel, and in particular relates to a gas shielded metal welding technology for medium manganese wear-resistant steel and Q345B low alloy steel. Background technique [0002] At present, the most widely used wear-resistant steels are high-manganese wear-resistant steels and medium-low alloy steels. The high manganese steel with austenitic structure undergoes work hardening on the surface under high impact load, forming ε-martensite and deformation twins, and the surface is hardened to a high degree. However, under medium and low impact loads, only stacking faults occur in the austenite structure of high manganese steel, and martensite and deformation twins cannot be formed, so the hardened layer is shallow, and the work hardening performance cannot be fully exerted, resulting in insufficient wear resistance . Medium manganese steel is devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/235B23K103/04
CPCB23K9/173B23K9/235B23K2103/04
Inventor 王军祥岳宏霖牛广义高继萍范桂霞王斐
Owner TIANJIN WILL LONG SCI &TECH CO LTD
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