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Method for avoiding crack formation of medium-high carbon steel during hybrid welding

A composite welding, medium-high carbon technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of unsuitable for large-scale welding operations and expensive welding materials, so as to reduce processing workload, improve quality, The effect of reducing production costs

Active Publication Date: 2016-06-29
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, austenitic welding materials are expensive and not suitable for large-scale welding operations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The steel type is 45# steel.

[0018] 1. Preheat the vacuum chamber and billet to make the billet temperature reach 300°C.

[0019] 2. The set welding speed of the vacuum composite welding torch is adjusted from 6m / s to 8m / s, and the set welding current is adjusted from 400ma to 350ma.

[0020] 3. Before formal welding, a short side with a length of 1.9 meters of the length of the end face of the slab is welded in parallel at 50mm below the pre-welded weld at the end of the slab.

[0021] 4. After welding the two ends and one side, wait for 2 hours for the other side before welding.

[0022] 5. After the other side is welded, a long side with a length of 4 meters of the length of the slab side is welded parallel to the side at its lower 50 mm.

[0023] 6. After the composite slab is welded, continue to place it in the sealed welding room for 12 hours.

Embodiment 2

[0025] The steel type is AGMJ45 steel.

[0026] 1. Preheat the vacuum chamber and billet to make the billet temperature reach 310°C.

[0027] 2. The set welding speed of the vacuum composite welding torch is adjusted from 6m / s to 7.9m / s, and the set welding current is adjusted from 400ma to 340ma.

[0028] 3. Before formal welding, a short side with a length of 2.2 meters of the length of the end face of the slab is welded in parallel at 49mm below the pre-welded weld at the end of the slab.

[0029] 4. After welding the two ends and one edge, wait for 2.1 hours for the other edge before welding.

[0030] 5. After the other side is welded, a long side with a length of 3.6 meters of the length of the slab side is welded parallel to the side at its lower 52 mm.

[0031] 6. After the composite slab is welded, it should be placed in the sealed welding room for 14 hours.

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Abstract

The invention provides a method for avoiding crack formation of medium-high carbon steel during hybrid welding. The method comprises the steps that a vacuum chamber and a casting blank are preheated till the temperature of the casting blank reaches 290-310 DEG C; the welding speed of a hybrid welding gun is set to be 7.9-8.2 m / s, and the welding current is set to be 340-360 ma; a short edge is welded on the portion below a pre-welded weld joint at the end of the casting blank in parallel before welding; after the two ends and one edge part are welded, the other edge part is welded to be closed after 1.9-2.1 hours, and a long edge is welded to the lower portion of the other edge part in parallel; and a composite plate blank continues to be placed in a closed welding machine room for 12-15 hours after welding is finished. By the adoption of the method, longitudinal cracks generated in the vacuum hybrid welding process of the medium-high carbon steel are effectively avoided, so that the treatment workload is reduced, the production cost is reduced, and the quality of a composite steel plate is greatly improved.

Description

technical field [0001] The invention belongs to the field of composite steel plate welding, and in particular relates to a method capable of avoiding the generation of cracks in the composite welding process of medium and high carbon steel (C≥20%). Background technique [0002] Medium and high carbon steels are insensitive to the formation of cold cracks due to their very large tendency to harden and form high carbon martensite. At the same time, the martensite structure formed in the heat-affected zone of welding is hard and brittle, resulting in a great decrease in the plasticity and toughness of the joint. Therefore, the welding performance of medium and high carbon steel is extremely poor, and hot cracks and cold cracks are prone to occur during welding. [0003] At present, when welding with structural steel electrodes, it must be preheated before welding, and the preheating temperature is controlled at 250-350°C. For multi-layer multi-pass welding, the first pass use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02
Inventor 周智勇张宏亮王鲁毅李超赵雷刘文飞王亮
Owner ANGANG STEEL CO LTD
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