Method for screening reasonable welding process parameters based on impact toughness

Abstract

The invention discloses a method for screening reasonable welding process parameters based on impact toughness and belongs to the fields of evaluation and representation of mechanical properties of materials. The method comprises the steps: 1) pretreating a steel plate; 2) carrying out single-path welding on the steel plate to obtain a welding plate comprising a complete welding heat affected zone; 3) intercepting an impact specimen on the welding plate, and forming a V / U-shaped gap; 4) detecting the impact toughness of the impact specimen to obtain the impact absorbing energy of the impact specimen, and determining the impact fracture behavior of the heat-affected zone; and 5) judging that the welding process parameters are reasonable when the impact absorbing energy of the welding plate is larger than or equal to that of 1 / 2 of the original steel plate and the impact fracture behavior of the heat-affected zone is ductile fracture, or else, judging that the welding process parameters are unreasonable. According to the method disclosed by the invention, the welding heat-affected zone is prepared by carrying out single-pass welding on a flat plate, so that the welding process parameters can be regulated within a wide range, the deterioration degree of the impact toughness of the heat-affected zone is evaluated for different welding processes, and reasonable process parameters are screened; and the method is few in welding process, convenient and rapid in operation, capable of reducing cost and high in efficiency.

Description

technical field [0001] The invention belongs to the field of mechanical property evaluation and characterization of materials, in particular to a method for screening reasonable welding process parameters based on impact toughness. Background technique [0002] Welding is an essential process in the construction of steel structures. With the large-scale, high-parameterization of engineering structures, and the deterioration of the service environment, the demand for high-performance medium-thick steel plates is increasing. During the construction of engineering structures, the same high-strength steel plate will inevitably experience welding processes with different parameters, resulting in varying degrees of changes in its original microstructure and properties. For example, taking the construction of the West-East Gas Pipeline Project as an example, high-strength pipeline steel generally needs to go through the gas shielded primer welding process, internal and external mu...

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Problems solved by technology

[0007] In view of the deficiencies in the prior art, especially when different process parameters are required for welding of steel plates, unreasonable process parameters will obviously deteriorate the impact toughness of the welding heat-affected zone, etc., the present invention provides a rapid screening of reasonable welding processes based on impact toughness Parameter method; the purpose is to provide a simple process, low cost, and convenient operation method for quickly evaluating the impact toughness of the welding heat affected zone and screening out reasonable welding process parameters, so as to solve the single and complicated operation of the current evaluation method of the impact toughness of the welding heat affected zone And other issues,

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