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A method for preventing cracks from welding cast steel and steel

A technology of cast steel joints and cast steel, applied in welding equipment, welding equipment, auxiliary welding equipment, etc., can solve the problems of limitation of cast steel components, poor plasticity, crack defects, etc., and achieve a simple surfacing process, good toughness and plasticity. Effect

Active Publication Date: 2016-03-30
广东华域重工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason for cracks is that the steel casting itself contains many defects and has poor plasticity.
When these defects gather and get close to the welded joint, under the action of restraint stress, crack defects will be generated, and the damage is very serious, which limits the application of cast steel components in welded structures

Method used

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  • A method for preventing cracks from welding cast steel and steel
  • A method for preventing cracks from welding cast steel and steel
  • A method for preventing cracks from welding cast steel and steel

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0030] The small converter support ring is a welded structure composed of Q345 steel segment and trunnion block made of ZG270-500 cast steel. The weldability of the casting is poor. figure 1 It can be seen that welding cracks are generated on the cast steel side. The techniques of increasing the preheating temperature, selecting high-quality ferrite electrodes and gas-shielded welding cannot solve the penetrating cracks in the heat-affected zone of cast steel. Adopt the method of surfacing the transition layer on the surface of the cast steel, so that there is no welding crack on the cast steel side.

[0031] 1. First surfacing the transition layer. Clean the welding surface of cast steel to remove rust, scale and other impurities to ensure a smooth surface. Then pre-surfacing austenitic weld metal on the cast steel welding surface, by figure 2 It can be seen that the surfacing area is U-shaped. In addition to the surfacing welding on the welding end of the cast steel, the...

Embodiment 2

[0043] The frame of the shearing machine is broken after long-term use, and the fracture is repaired by welding. The frame is made of ZG270-500 cast steel, which contains many casting defects and poor weldability. Increasing the preheating temperature, selecting high-quality ferrite electrode and gas shielded welding can not solve the penetrating cracks in the heat-affected zone of the casting. The method of surfacing transition layer is used to prevent welding cracks on the cast steel side.

[0044] 1. First surfacing the transition layer. Clean the welding surface of cast steel to remove rust, scale and other impurities to ensure a smooth surface. Then pre-surfacing austenitic weld metal on both sides of the cast steel welding surface, the surfacing area is U-shaped, in addition to the surfacing on the welding end of the cast steel, the upper and lower surfaces of the cast steel near the end face should also be surfacing, The width of the surfacing weld should be more tha...

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Abstract

The invention relates to a steel metal welding method, in particular to a method for preventing cracks in the cast steel and steel welding process. The method includes the following steps that a transition layer is welded in a build-up mode, the welding face of cast steel is cleared, austenite weld metal is welded to the welding face of the cast steel in a build-up mode in advance, and welding rod electric-arc welding is used for carrying out build-up welding on the welding face of the cast steel; the steel is beveled, spot welding of a welding joint of the steel and the cast steel is firm, the joint of the steel and the cast steel is welded, a cap weld is grinded, after the joint of the steel and the cast steel is welded, the surface of the weld seam is grinded, and a weld toe is grinded into smooth transition; after the weld seam is grinded, the weld seam and the periphery of the weld seam are detected. The cast steel side can be effectively prevented from generating the cracks, and the build-up welding process is simple, reliable and efficient. The transition layer can release welding stress generated in the welding process, and through detection after the steel and the cast steel are welded, it is effectively prevented that the cast steel side generates the welding cracks in the welding joint of the cast steel and the steel.

Description

technical field [0001] The invention relates to a metal welding method, in particular to a method for preventing cracks from welding cast steel and steel. Background technique [0002] In the welded joints between cast steel and steel, at the welded joints of cast steel, the transition layer with a thickness of 5 mm is pre-surfacing by electrode arc welding, and the transition layer is austenitic weld metal. The toughness and plasticity of the transition layer is not large, and the transition layer will not produce large welding stress in the cast steel, resulting in welding cracks in the cast steel. When casting steel and steel are welded, using the transition layer to release the stress of cracks in cast steel can effectively prevent cracks near the welded joint of cast steel when welding cast steel and steel. [0003] In engineering structures, dissimilar steel welded structures are more and more widely used in various fields of engineering, such as metallurgy, shipbuild...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K37/00
CPCB23K9/04B23K9/167B23K9/23B23K31/125B23K2103/04
Inventor 杨芙张文明张姝焦万才王滨杨家武王新宇
Owner 广东华域重工有限公司