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Process for welding 800MPa high-strength steel without preheating

A high-strength steel and welding process technology, applied in welding equipment, welding medium, welding equipment, etc., can solve the problems of low-matching welding materials without preheating, etc., and achieve the advantages of reducing welding costs, improving crack resistance, and strong applicability Effect

Active Publication Date: 2007-05-16
BEIJING CHONGLEE MACHINERY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the shortcomings of current 800MPa high-strength steel in the prior art using equal-strength matching welding wire, pre-welding preheating and post-welding heat treatment welding processes, the problem to be solved by the present invention is to propose a low-matching welding material that does not require preheating and does not require welding. Welding process method for post-weld heat treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Base material: HG785 low-alloy quenched and tempered high-strength steel with a thickness of 30mm, butt joint (double-sided V-shaped groove, groove angle 45°), and the size of the test plate is 600mm×220mm×30mm.

[0028] Welding material: 600MPa and 800MPa gas-shielded flux-cored wire, diameter φ1.6mm.

[0029] Welding method: Ar+CO 2 Mixed gas shielded welding (using pulse welding power supply), where Ar and CO 2 The volume percentage is 80%: 20%.

[0030] Welding process parameters: welding voltage 30V ~ 32V, welding current 210V ~ 230A, welding speed 0.4cm / s ~ 0.5cm / s, welding line energy 1 5.8kJ / cm ~ 18.4kJ / cm, shielding gas flow: 18 ~ 21L / min; number of welding layers: 4 layers, number of welding passes: 8, using multi-layer multi-pass welding.

[0031] Key points of welding technology: Welding is performed without preheating at a room temperature of 24°C. Before welding, mechanical and chemical treatments are used to clean the groove surface to remove oil and ...

Embodiment 2

[0034] Base material: HQ80 low-alloy high-strength steel with a thickness of 25mm, T-shaped joint stiffener plate of box-shaped structure. The vertical plate of the T-shaped joint has a 45° single-sided V-shaped groove, and the size of the test plate is 400mm×220mm×20mm.

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Abstract

The invention relates to a non-preheat welding method of high-strength steel whose tensile strength 800MPa, wherein it comprises (1), the connector has V-shape slope cut; (2), cleaning the slope before welding; (3), using impulse welding power source to weld in Ar+CO2 mixed gas or CO2 gas, while the welding voltage is 30-34V, the welding current is 200-240A, the welding speed is 0.4cm / s-0.6cm / s, the welding heat input is 10kJ / cm-20kJ / cm, and the protect gas flux is 15L / min-25L / min;(4), using 600MPa or 700MPa drug welding or solid welding wire to weld bottom, while other welding channels use 800MPa drug welding wire to multilayer weld, without intermission; (5), using alumina silicate plate to cover the welding head, to cool. The invention can avoid preheat and following thermal treatment, with low cost, while the welding seam has high flexibility.

Description

technical field [0001] The invention relates to a welding process, in particular to a welding process method for 800MPa grade low-alloy high-strength steel without preheating and post-weld heat treatment, and belongs to the technical field of high-strength steel welding. Background technique [0002] With the development of welded structures with high parameters, light weight and large scale, high-efficiency hydraulic transmission and support are widely used in construction machinery and mining machinery, which requires a large increase in the load-carrying capacity of welded structures with a small increase in self-weight . Therefore, in order to adapt to this working environment in engineering applications, high-strength steel welded structures must be used. [0003] In recent years, the progress of metallurgical production technology, such as the development of refining outside the furnace, vacuum degassing, pressure quenching, etc., especially the application of compute...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/095B23K9/235B23K35/38B23K33/00C21D9/50B08B1/00B08B3/08C23G1/02B23K9/09B23K35/02B23K35/24B23K9/02B23K9/013
Inventor 李亚江王娟沈孝芹
Owner BEIJING CHONGLEE MACHINERY ENG
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