Non-preheating gas shielded welding method for wear-resistant steel plate

A wear-resistant steel plate, welding method technology, applied in welding equipment, welding medium, welding equipment and other directions, can solve the problems of reduced crack resistance, reduced plastic toughness of welds, increased cost, etc., to improve welding production efficiency, welding Simple process and the effect of reducing production costs

Active Publication Date: 2015-12-16
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to prevent cold cracks, it is often necessary to reduce the efficiency of welding construction and deteriorate the construction conditions, such as the use of high temperature preheating before welding and heat treatment after welding, which increases the complexity of the welding process and inoperability in special cases , which endangers the safety and reliability of the welded structure. For wear-resistant steel plates with high strength, the welding problem is particularly obvious.
For HBW450 wear-resistant steel with a strength level greater than 1000MPa, it is very difficult to match the weld metal and the base metal to achieve equal strength. Even if the weld reaches the equal strength, the plasticity and toughness of the weld often decrease to an unacceptable level. The degree of crack resistance 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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  • Non-preheating gas shielded welding method for wear-resistant steel plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) The high-strength wear-resistant steel plate NM450 with a carbon equivalent greater than 0.48% and a hardness level of HBW450 produced by quenching + low-temperature tempering treatment, and the combination of thick plates is 16mm+16mm. The size of the test plate is 600mm (longitudinal) × 300mm (horizontal) × 16mm (thickness);

[0019] Matching welding material: The chemical composition and weight percentage of GHS70-2 welding wire are: C: ≤0.10%, Mn: 1.50~1.80%, Si: 0.40~0.80%, P: ≤0.020%, S: ≤0.002%, Mo: 0.25-0.50%, Ni: 1.30-1.50%, Cr: 0.20-0.40%, Cu≤0.50%, and the balance is Fe and unavoidable impurities.

[0020] Protective gas: 80% Ar+20% CO 2 mixed composition.

[0021] (2) see figure 1 , The gas shielded welding groove adopts symmetrical double-sided X-shaped groove, the groove angle is 60°, the groove gap is 2mm, and the blunt edge is 2mm;

[0022] (3) The oil stains and rust at 20 mm from the edge of the groove are all ground and polished to remove the ...

Embodiment 2

[0026] (1) The high-strength wear-resistant steel plate NM450 with a carbon equivalent greater than 0.48% and a hardness level of HBW450 produced by quenching + low-temperature tempering treatment, and the combination of thick plates is 25mm+25mm. The size of the test plate is 600mm (longitudinal) × 300mm (horizontal) × 25mm (thickness);

[0027] Matching welding material: The chemical composition and weight percentage of GHS70-2 welding wire are: C: ≤0.10%, Mn: 1.50~1.80%, Si: 0.40~0.80%, P: ≤0.020%, S: ≤0.002%, Mo: 0.25-0.50%, Ni: 1.30-1.50%, Cr: 0.20-0.40%, Cu≤0.50%, and the balance is Fe and unavoidable impurities.

[0028] Protective gas: 80% Ar+20% CO 2 mixed composition.

[0029] (2) The gas shielded welding groove adopts symmetrical double-sided X-shaped groove, the groove angle is 61°, the groove gap is 3mm, and the blunt edge is 1mm;

[0030] (3) The oil stains and rust at 20 mm from the edge of the groove are all ground and polished to remove the rust and oil sta...

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Abstract

The invention discloses a non-preheating gas shielded welding method for a wear-resistant steel plate. The non-preheating gas shielded welding method comprises the following steps: adopting a high-strength wear-resistant steel plate with carbon equivalent greater than 0.48% and hardness level of HBW450; selecting a gas mixture of 20% CO2 and 80% Ar and a GHS70-2 soldering wire; adopting fixed-point welding, not preheating before welding, and controlling a temperature between welding beads of a filling and cosmetic-welding welding seam to 100-150 DEG C; adopting an arc-connected left welding method for backing welding, controlling backing welding current to 150-170 A, welding voltage to 18-22V and welding speed to 10-15cm / min, and guaranteeing good back forming; controlling welding current during interlayer and cosmetic welding to 200-230 A, welding voltage to 25-28 V and welding speed to 20-25cm / min; and controlling thermal input to 16-20kJ / cm. According to the non-preheating gas shielded welding method, a welding joint has relatively high strength, and a welding seam has excellent low-temperature toughness resistance.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material welding, and in particular relates to a preheating-free gas shielded welding method for wear-resistant steel plates. Background technique [0002] Wear-resistant steel plates are widely used in mechanical products such as engineering, mining, construction, cement production, coal, electric power and metallurgy with high wear resistance, such as super large dump trucks, bulldozers, loaders, excavators, stacker-reclaimers, Scraper conveyors and loaders and other equipment with harsh working conditions. At the same time, wear-resistant steel is usually a welded structural part, which requires that the wear-resistant steel base material not only have excellent wear resistance, but also the position of the welded joint must have excellent comprehensive properties. High-strength wear-resistant steel, especially HBW450 wear-resistant steel, has a high carbon content of more than 0.48% an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K35/30B23K101/16B23K103/04
CPCB23K9/173B23K35/3073
Inventor 麻衡周平马光亭邓文磊王纲一黄少文霍孝新
Owner SHANDONG IRON & STEEL CO LTD
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