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Argon-rich mixed gas shielded welding method for NM450 high-strength wear-resistant steel

A high-strength wear-resistant steel and mixed gas technology, applied in the field of wear-resistant steel welding, can solve the problems of decreased crack resistance, increased cost, decreased plastic toughness of welds, etc. The effect of resistance to cold crack susceptibility

Pending Publication Date: 2022-03-15
BAOTOU IRON & STEEL GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For steels 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-rich mixed gas shielded welding method for NM450 high-strength wear-resistant steel

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Experimental program
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Effect test

Embodiment 1

[0021] 1. The NM450 high-strength wear-resistant steel plate with a carbon equivalent of 0.66% and a hardness level of HB450 produced by quenching and tempering treatment is a combination of 45mm+45mm, and the size of the test plate is 300mm×150mm×45mm;

[0022] Matching welding materials:

[0023] The chemical composition of welding wire HS-70 is C: ≤0.12%, Mn: 1.40-1.70%, Si: 0.35-0.80%, P: ≤0.020%, S: ≤0.002%, Mo: 0.20-0.50 %, Ni: 1.30-1.50%, Cr: 0.20-0.40%, the balance is Fe and unavoidable impurities; protective gas: 80% Ar ten 20% CO2 mixed gas; such as figure 1 As shown, the groove adopts a symmetrical double-sided X-shaped groove, the groove angle is 60°, the blunt edge is 2mm, and the groove gap is 1-2mm; before welding, remove the rust and oil within 20mm around the weld, and grind the slope Metallic luster leaks from the mouth;

[0024] 2. Preheat the NM450 wear-resistant steel to be welded to 175°C, and control the interpass temperature at 100-200°C;

[0025] 3....

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Abstract

The invention discloses an argon-rich mixed gas shielded welding method for NM450 high-strength wear-resistant steel. The argon-rich mixed gas shielded welding method comprises the following steps that a high-strength wear-resistant steel plate with the HB450 hardness level is adopted for flat plate butt welding; a mixed gas of 80% of Ar and 20% of CO2 and an HS-70 welding wire are selected for multi-layer and multi-pass welding; rust and greasy dirt on the periphery of a weld joint are removed before welding, preheating is conducted at the temperature of 175 DEG C or above, the temperature between filling and capping weld beads is not lower than 100 DEG C, the welding heat input amount during welding is controlled to be 10.0-15.8 KJ / cm, and hydrogen elimination treatment is conducted at the temperature of 200 DEG C for 3 h after welding. A welding joint has high strength, and a welding seam has excellent crack resistance.

Description

technical field [0001] The invention relates to the field of wear-resistant steel welding, in particular to an argon-rich mixed gas shielded welding method for NM450 high-strength wear-resistant steel. Background technique [0002] In recent years, with the development of the coal market and the improvement of mechanized coal mining, high-strength wear-resistant steel, as a high-strength, high-hardness, and high-wear-resistance steel, has been widely used in mining machinery, excavating Transportation machinery and other fields to improve the service life of equipment. Therefore, the welding performance of high-strength wear-resistant steel has also attracted widespread attention. NM450 high-strength wear-resistant steel plate is a low-alloy structural steel with a large carbon equivalent. During the welding heat cycle, due to the high carbon and alloy content, it has a high hardening tendency and cold crack sensitivity. The martensitic structure is easily formed in the af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/235B23K9/16
CPCB23K9/235B23K9/16
Inventor 王婷袁晓鸣黄利王少炳张凤鸣
Owner BAOTOU IRON & STEEL GRP
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