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Argon-enriched mixed gas protection welding method for high-strength abrasion-resistant steel

A high-strength wear-resistant steel, mixed gas technology, applied in welding media, welding equipment, welding equipment and other directions, can solve the problems of decreased crack resistance, increased cost, decreased plastic toughness of welds, etc., to improve impact toughness, reduce Production cost, effect of improving cold crack susceptibility

Inactive Publication Date: 2011-05-11
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For steel types with a strength level greater than 1000MPa, it is very difficult to match the weld metal with the base metal to achieve equal strength. The cracking performance is also significantly reduced. In order to prevent welding cracks, the construction conditions are extremely strict and the cost is greatly increased.

Method used

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  • Argon-enriched mixed gas protection welding method for high-strength abrasion-resistant steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) High-strength wear-resistant steel plate NM400 with a hardness level of HB400 produced by quenching and tempering treatment, and the combination of thick plates is 16mm+16mm. The size of the test plate is 450mm×400mm×16mm;

[0022] Matching welding materials:

[0023] The chemical composition and weight percentage of welding wire are: C: ≤0.10%, Mn: 1.30~1.80%, Si: 0.40~0.80%, P: ≤0.013%, S: ≤0.005%, Mo: 0.20~0.55%, Ni: 0.7%-0.9%, the balance is Fe and unavoidable impurities.

[0024] Protective gas: 80%Ar+20%CO 2 mixed composition

[0025] (2) The gas shielded welding groove adopts asymmetrical double-sided X-shaped groove, the groove angle is 60??, the groove gap is 0-1mm, and the blunt edge is 0mm;

[0026] (3) Preheat the NM400 wear-resistant steel to be welded to 75°C, and the preheating range is not less than 75mm on both sides of the welding groove;

[0027] (4) Welding process parameters: welding current 230A, arc voltage 25V, welding speed 33cm / min, w...

Embodiment 2

[0030] (1) High-strength wear-resistant steel plate NM400 with a hardness level of HB400 produced by quenching and tempering treatment, and the combination of thick plates is 40mm+40mm. The size of the test plate is 450mm×400mm×40mm;

[0031] Matching welding materials:

[0032] The chemical composition and weight percentage of welding wire are: C: ≤0.10%, Mn: 1.30~1.80%, Si: 0.40~0.80%, P: ≤0.013%, S: ≤0.005%, Mo: 0.20~0.55%, Ni: 0.7%-0.9%, the balance is Fe and unavoidable impurities.

[0033] Protective gas: 80%Ar+20%CO 2 mixed composition

[0034] (2) The gas shielded welding groove adopts symmetrical double-sided X-shaped groove, the groove angle is 60??, the groove gap is 0-1mm, and the blunt edge is 1mm;

[0035] (3) Preheat the NM400 wear-resistant steel to be welded to 100°C, and the preheating range is not less than 120mm on both sides of the welding groove;

[0036] (4) Welding process parameters: welding current 270A, arc voltage 29V, welding speed 30cm / min, ...

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Abstract

The invention discloses an argon-enriched mixed gas protection welding method for high-strength abrasion-resistant steel, which comprises the following steps: adopting high-strength abrasion-resistant steel plates the hardness grades of which are the same, and combining and butting the steel plates the thicknesses of which are the same; adopting mixed gas containing 80% of Ar and 20% of CO2 and BHG-3 welding wires; eliminating iron rust and greasy dirt around welding seams before welding; when the fixed point butt welding and backing welding on the steel plate the thickness of which is 32mm or below 32mm is carried out, preheating to 75 DEG C before welding, and continuously welding, wherein the temperature among the welding beads of filing and cap welding seams is not lower than 60 DEG C, and the welding heat input quantity is controlled at 10-15 Kj / cm in the welding process; and when the fixed point butting welding and backing welding on the steel plate the thickness of which is 40mm is carried out, preheating to 100 DEG C before welding, and continuously welding, wherein the temperature among the welding beads of the filing and cap welding seams is not lower than 75 DEG C, and the welding heat input quantity is controlled at 10-15 Kj / cm in the welding process. By the invention, welding joints have higher strength, and the welding seams have excellent crack resistance.

Description

technical field [0001] The invention belongs to the field of iron and steel material welding, and in particular relates to an argon-rich mixed gas shielded welding method for high-strength wear-resistant steel. Background technique [0002] Wear-resistant steel plates are widely used in mechanical products such as loaders, excavators, and scraper conveyors, which require high strength and good wear resistance under harsh working conditions, mining machinery, cement production, electric power, and metallurgy. With the rapid development of my country's national economy, the demand for wear-resistant steel plates has grown rapidly, and the strength and hardness of wear-resistant steel tend to be higher to adapt to harsh working environments. Due to the high carbon content of high-strength wear-resistant steel, which is about 0.18%-0.20%, at the same time, Cr, Mo, B and other alloying elements are added to improve hardenability and hardenability, so its hardness and brittleness ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/235B23K9/095B23K35/30
Inventor 楚觉非邱红雷李丽王端军王徐李定金刘朝霞
Owner NANJING IRON & STEEL CO LTD
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