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Process for repair-welding steel casting through flux-cored wire CO2 gas shielded welding

A technology for steel castings and welding processes, which is applied in the direction of manufacturing tools, welding equipment, arc welding equipment, etc., can solve the problems of low efficiency, difficult slag removal, and high cost of manual electrode arc welding, achieve strong corrosion resistance, and reduce labor costs. Strength, the effect of saving production costs

Active Publication Date: 2014-05-07
江苏万恒铸业有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to provide a flux-cored wire CO 2 Gas-shielded welding is a process for repairing steel casting defects. Applying this process to weld and repair cast steel products solves the problems of low efficiency, troublesome joints, difficult slag removal, and high cost of manual electrode arc welding, and eliminates the problems that are easy to occur in the welding repair area Defects such as micro-cracks, pores, slag inclusions, etc.

Method used

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  • Process for repair-welding steel casting through flux-cored wire CO2 gas shielded welding

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Embodiment Construction

[0020] Taking ASME SA-351 / 351M CF8M valve casting defect welding repair as an example to illustrate the implementation process of this process.

[0021] Its physical and chemical properties are chemical composition C≤0.08%, Si≤2.00%, Mn≤1.50%, P≤0.04%, S≤0.04%, Cr=18-21%, Mo=2-3%, Ni=9-12 %. Mechanical properties: tensile strength ≥ 485Mpa, yield strength ≥ 205Mpa, elongation ≥ 30%.

[0022] 1. Welding wire and test piece preparation: According to the base metal material of steel castings, the standard of flux-cored welding wire of corresponding material is AWS A5.22. The grade of welding wire is E316LT1-1, and the specification adopts disc wire with straight diameter of Φ1.2mm, CO 2 The gas concentration is 99.95%.

[0023] 2. Welding procedure qualification: in accordance with the requirements of ASME Volume IX. The size of the welding test piece is 350mm×150mm×30mm. The test piece adopts butt welding, flat welding position, chooses reasonable welding process parameters,...

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Abstract

The invention relates to the cast steel industry, particularly to a process for repair-welding a steel casting through flux-cored wire CO2 gas shielded welding. During the application, the process for repair-welding steel casting products is characterized by selecting a flux-cored wire matched with a casting base material, determining welding process parameters reasonably, selecting a welding current of 150-300 A, a welding voltage of 23-40 V, a wire extension length of 15-25mm, a welding speed of 45-90 mm / s, a gas flow of 20-25 L / min, and performing WPQ (welding procedure qualification ) according to the IX volume of ASME (American Society of Mechanical Engineers). The process for repair-welding the steel casting through the flux-cored wire CO2 gas shielded welding solves the problem of low efficiency, high labor intensity, multiple joints and slag removal difficulty of manual SMAW (shielded metal arc welding), eliminates defects such as microcracks, porosity and slag inclusion of a repair-welding area, when compared with the SMAW, can improve the working efficiency to 3-5 times, reduces production costs to more than 50%, enables the hydrogen content of weld metal to be lower than 2.0 ppm and corrosion resistance to be strong, guarantees that physical and chemical properties accord with and exceed requirements of corresponding cast steel material standards, and is applicable to high-grade, precise and top-notch steel castings and steel castings of high pressure hydrogen valves.

Description

technical field [0001] The invention relates to the steel casting industry, and relates to the flux-cored welding wire CO 2 Gas-shielded welding is a process for repairing defects in steel castings. Using this process to repair steel castings, it solves the problems of low efficiency of manual electrode arc welding, many joints, difficult slag removal, high labor intensity for welders, and high cost. Defects such as micro-cracks, pores, and slag inclusions are prone to appear on the repaired area. It can improve the work efficiency by 3-5 times, reduce the production cost by more than 50%, the hydrogen content in the weld metal is lower than 2.0ppm, and has strong corrosion resistance. It is suitable for high-precision, cutting-edge steel castings and high-pressure hydrogen-facing valve steel castings. It improves the quality of welding repairs, enhances the performance of high temperature resistance, high pressure resistance, corrosion resistance, and hydrogen corrosion resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173
CPCB23K9/04B23K9/095B23K9/16B23K9/235
Inventor 卢克华陈德苏孙志标
Owner 江苏万恒铸业有限公司
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