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CO2 gas protected single-sided welding and double-sided forming process

A single-sided welding double-sided, gas shielding technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of too thin weld bead, low welding efficiency, fast welding speed, etc., to improve the resistance to tensile stress Ability, avoid thermal cracks, increase the thickness of the effect

Inactive Publication Date: 2009-06-17
GUANGZHOU WENCHONG SHIPYARD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a larger current is used, the welding speed is too fast, the weld bead is too thin, and thermal cracks are easily generated
With this welding method, the thickness of the bottom layer weld seam is not greater than 5mm under the condition of small welding current and the need to ensure single-sided welding and double-sided forming. The second layer of welding bead cannot use a high-current welding method, and the welding efficiency is low.

Method used

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  • CO2 gas protected single-sided welding and double-sided forming process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] CO in this example 2 Gas-shielded single-sided welding double-sided forming welding process, which includes the following steps: (1) opening a groove 1 on the butt weldment, and the gap between the groove 1 is 0.05 mm; (2) spot welding and fixing in the groove 1; 3) Paste ceramic liner 2 on the reverse side of groove 1; (4) Fill scrap metal wire 3 in groove 1, and the thickness of scrap metal wire 3 should ensure that the welding seam of the first layer is 10mm; (5) Carry out the first layer root pass, i.e. in CO 2 Under gas protection, a current of 540 amperes is used for single-sided automatic welding, and a larger welding current is used to melt the spot-welded weld and the base metal at the root of the narrow groove that cannot be melted by conventional processes, and become a part of the root weld. Specification features: metal cored flux cored wire 4 is used, the specification of metal cored flux cored wire 4 is φ1.6mm, the welding position is V-groove flat butt ...

Embodiment 2

[0026] CO in this example 2 Gas-shielded single-sided welding double-sided forming welding process, which includes the following steps: (1) opening a groove 1 on the butt weldment, and the gap between the grooves 1 is 3.5 mm; (2) spot welding and fixing in the groove 1; 3) Paste ceramic liner 2 on the reverse side of groove 1; (4) fill scrap metal wire 3 in groove 1, and the thickness of scrap metal wire 3 should ensure that the welding seam of the first layer is 8 mm; (5) carry out the first layer root pass, i.e. in CO 2 Under gas protection, a current of 480 amperes is used for single-sided automatic welding, and a larger welding current is used to melt the spot-welded weld and the base metal at the root of the narrow groove that cannot be melted by conventional processes, and become a part of the root weld. Specification features: The metal core type flux cored wire 4 is used, the specification of the metal core type flux cored wire 4 is φ1.6mm, the welding position is V-s...

Embodiment 3

[0028] CO in this example 2 Gas shielded single-sided welding and double-sided forming welding process, which includes the following steps: (1) opening a groove 1 on the butt weldment, and the gap between the groove 1 is 8 mm; (2) spot welding and fixing in the groove 1; 3) Paste the ceramic liner 2 on the reverse side of the groove 1; (4) fill the groove 1 with broken metal wire 3, and the thickness of the broken metal wire 3 should ensure that the welding seam of the first layer is 7 mm; (5) carry out the first layer root pass, i.e. in CO 2 Under gas protection, a current of 420 amperes is used for single-sided automatic welding, and a larger welding current is used to melt the spot-welded weld and the base metal at the root of the narrow groove that cannot be melted by conventional processes, and become a part of the root weld. Specification features: metal cored flux cored wire 4 is used, the specification of metal cored flux cored wire 4 is φ1.6mm, the welding position i...

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Abstract

The CO2 gas protected single-sided welding and double-sided forming process includes the following steps: cutting bevels in the pieces to be butt welded; spot welding to fix the bevels; adhering ceramic lining to the opposite side of the bevels; filling smashed metal wires in the thickness capable of forming welding seam over 7 mm between the bevels; bottoming welding under the protection of CO2 gas at the welding current of 420-540 A; and 6. the subsequent welding. The present invention has the advantages of double-sided forming via single-sided welding, capacity of preventing heat crack in large current condition, and no weld penetration.

Description

technical field [0001] The present invention relates to a welding process, in particular to CO 2 Gas shielded single-sided welding and double-sided forming welding process. Background technique [0002] At home and abroad, there are ship hull structure steel plate docking CO 2 The single-side welding and double-side forming process is mainly: conventional CO 2 Semi-automatic single-sided welding method, which requires joint groove gap 4 ~ 8mm, welding current not greater than 220 amperes, welding speed not greater than 120 mm / min. Due to the small welding current used, the spot weld cannot be melted, so spot welding cannot be performed in the groove, and a fixed code plate needs to be installed. If a larger current is used, the welding speed is too fast, the weld bead is too thin, and thermal cracks are easily generated. In this welding method, the thickness of the bottom layer weld seam is not greater than 5mm under the condition of small welding current and the need to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16B23K9/095B23K9/035B23K9/235B23K33/00B23K35/04B23K9/18
Inventor 刘桑韦添源胡盛跃
Owner GUANGZHOU WENCHONG SHIPYARD CO LTD
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