Gas-shielded welding method for pearlite heat-resistant steel structural members

A technology for pearlitic heat-resistant steel and steel structural parts, applied in welding equipment, welding/welding/cutting items, arc welding equipment, etc., can solve the problems of carbon equivalent value reduction, welding strength reduction, etc., and achieve simple equipment , to avoid cracks, delay the effect of cooling rate

Active Publication Date: 2015-06-03
哈焊所华通(常州)焊业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the technical problems that the carbon equivalent value decreases and the welding strength decreases when arc welding or submerged arc welding is used for the pearlitic heat-resistant steel with large thickness.

Method used

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  • Gas-shielded welding method for pearlite heat-resistant steel structural members
  • Gas-shielded welding method for pearlite heat-resistant steel structural members
  • Gas-shielded welding method for pearlite heat-resistant steel structural members

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Embodiment Construction

[0023] Adopt ASTMA3870 (American steel plate standard, similar to national standard 13CrMoA heat-resistant steel), thickness 100mm, mass fraction C≤0.17%, Mn0.4~0.65%, Si0.5~0.8%, Cr1.0~1.5%, Mo0.45 ~0.65%; total content of alloying elements ≥ 5%; matching welding material: 18CrMoA, diameter 1.2mm, mass fraction C 15~0.22%, Mn0.4~0.7%; Si0.15~0.35%; Cr0.8~1.10 %, Mo0.15~0.25%;

[0024] The protective groove adopts double-sided V-shaped groove, the angle of the groove is 35° on one side, and the blunt side is 2mm; no gap is left in the butt joint, and it is welded by fusion welding.

[0025] The equipment adopts DC welding power supply with surface tension transition characteristics, welding current 240~260A, welding voltage 24~28V, welding speed 30~35cm / min, welding line energy 13~16KJ / cm, M6×40×1.2 tapered external insulation Source contact tip; protective gas 80%Ar+20%CO 2 Argon-rich mixed gas substitute, gas flow rate 15L / min~20L / min; process measures: preheating temperat...

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Abstract

The invention provides a gas-shielded welding method for pearlite heat-resistant steel structural members and relates to butt weld welding processes for the pearlite heat-resistant steel structural members. The gas-shielded welding method is a measure which is used for solving the problem that the carbon equivalent value is reduced caused due to the fact that the thickness of steel materials is large. The gas-shielded welding method comprises the selecting and matching of welding materials, a bevel machining process, welding process parameters and welding methods. The welding method has the advantages that no limitations to environments exist, the operation is simple and convenient, equipment is simple and efficient, the disadvantage of low welding strength caused due to the large thickness of workpieces is overcome, and the tendency of the cracking of welded seams and heat-affected zones is better prevented.

Description

technical field [0001] The invention relates to a gas-shielded welding process for butt welds of pearlite heat-resistant steel. Background technique [0002] Due to the limitation of the shape of the structural parts and the welding position, the welding method in the manufacturing process is mostly electrode arc welding. There are many limitations in electrode arc welding. 1. The production efficiency is low. The health and emotions of welders are greatly affected. 3. The production quality of welding rods and the use environment are high. 4. The heat of the arc and the high temperature generated increase the burning loss of some chemical alloy elements, and the mechanical properties are reduced and unstable. [0003] In recent years, with the development of my country's manufacturing technology, the application of heat-strength steel has become more and more extensive, such as furnace parts, heat exchangers, steam turbine rotors and turbine blades, boiler superheaters, etc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16B23K103/04
Inventor 刘亚丰
Owner 哈焊所华通(常州)焊业股份有限公司
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