Method for testing crack resistance of welding wire

An experimental method and anti-cracking technology, applied in welding equipment, arc welding equipment, welding/welding/cutting items, etc., can solve problems such as unqualified welds, poor weldability, hot cracks in welds, etc., to avoid welding seams Unqualified, the effect of ensuring welding quality

Inactive Publication Date: 2020-01-24
CSSC HUANGPU WENCHONG SHIPBUILDING COMPANY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with low-carbon steel, low-alloy high-strength steel has poor weldability and is prone to welding cracks
Especially when low-alloy high-strength steel is welded with carbon dioxide gas shielded flux core wire backing, if there are quality problems or improper matching of welding materials, it is easy to cause thermal cracks in the weld, resulting in unqualified welds

Method used

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  • Method for testing crack resistance of welding wire
  • Method for testing crack resistance of welding wire
  • Method for testing crack resistance of welding wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0039] To study the crack resistance of a certain type of welding material, prepare two E36 steel plates with a size of 300mm*150mm, and open a 45-degree bevel on the long side of the plate. The two boards are fixed together by 3 horse boards, the gap between the boards is 8mm, the horse board and the steel plate are welded together, and the welding angle is 8mm. The reverse side of the board is pasted with a ceramic liner. CO2 gas shielded welding is used for bottom welding of the ceramic liner butt weld in the horizontal position, and the thickness of the weld is 3mm. Place it for more than 24 hours, carry out coloring flaw detection, and check whether the weld seam is cracked.

[0040] By adopting the welding wire crack resistance test method provided by the invention, the present invention provides a simple and quick method for the welding wire type selection and welding wire crack resistance test of the marine low-alloy high-strength steel plate before welding, avoiding ...

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Abstract

The invention discloses a method for testing the crack resistance of a welding wire. The method comprises the steps of: preparing two steel plates, and forming a 45-degree groove on one side of a longedge of each of the two steel plates; splicing the sides with the grooves of the long edges of the two steel plates, and attaching ceramic pads to the opposite sides of the grooves of the two steel plates; performing backing weld on butt welds of the ceramic pads at horizontal positions via CO2 gas shielded welding; and performing dye penetrant inspection on the tested steel plates after the welding is completed to check the crack conditions of the backing weld seams. According to the method disclosed by the invention, the welding and dye penetrant inspection are performed on the tested steelplates to check the crack conditions of the backing weld seams, so as to detect the weld cracks, avoid the disqualification of the seams caused by thermal cracks generated in the seams and to ensurethe welding quality.

Description

technical field [0001] The invention relates to the technical field of ship welding, in particular to a welding wire crack resistance test method. Background technique [0002] With the continuous advancement of shipbuilding technology, steel plates for ships have gradually changed from low-carbon steel to low-alloy high-strength steel. Compared with low-carbon steel, low-alloy high-strength steel has poor weldability and is prone to welding cracks. Especially when low-alloy high-strength steel is welded with carbon dioxide gas shielded flux core wire backing, if there are quality problems or improper matching of welding materials, it is very easy to cause thermal cracks in the weld, resulting in unqualified welds. Contents of the invention [0003] The invention provides a welding wire crack resistance test method. By welding the test steel plate and coloring flaw detection, the cracking of the bottom weld seam can be obtained through inspection, so as to realize the det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/91B23K9/16B23K9/235
CPCB23K9/16B23K9/235B23K2103/04G01N21/91
Inventor 丁正祥赵凯罗汉清夏文亚陈红亮余庆何源李武凯
Owner CSSC HUANGPU WENCHONG SHIPBUILDING COMPANY
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