Wide-gap vertical butt-joint single face CO2 welding technology and copper gasket special for welding technology

Abstract

The invention discloses a wide-gap vertical butt-joint single face CO2 welding technology. The welding technology comprises the following steps that S1, a copper gasket is arranged on the back face of a wide-gap groove in a cushioned mode; S2, backing weld is carried out on the front face of the groove, and the copper gasket is cooled when the groove is welded; S3, multi-way filling welding is carried out. The invention further discloses the copper gasket special for the welding technology. The copper gasket comprises a strip-shaped body, the strip-shaped body at least comprises an attaching face, a groove is formed in the attaching face in the length direction of the strip-shaped body and filled with a ceramic material, a channel is formed in the strip-shaped body in the length direction, a blind hole is formed in the side wall face of the strip-shaped body, and the end of the blind hole is communicated with the channel. The toughness of a weld joint zone can be effectively improved, the toughness of a heat affected zone can be effectively prevented from lowering, and generation of inclusion is eradicated.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a wide-gap vertical butt joint single-sided CO 2 Welding process and special copper backing. Background technique [0002] Wide gap vertical butt joint single-sided CO 2 The main purpose of welding (hereinafter referred to as wide-gap welding) is to weld in the vertical position when the ultra-wide gap of large joints of the hull is 8-23mm. At present, ceramic liner CO is mostly used for large-scale welding of hull 2 Welding and gas-electric vertical welding, for the former, the gap is required to be 5-8 mm, and the ultra-wide groove gap is used on-site with the "long meat" (groove surfacing) process, and the groove is trimmed to the standard gap (10 mm) after surfacing welding. ㎜ or less), its production efficiency is greatly reduced. For welds with ultra-wide gaps, if the welding is performed directly, the bottom weld bead will produce serious segregation and inclusions, a...

AI Technical Summary

Problems solved by technology

At present, ceramic liner CO is mostly used for large-scale welding of hull 2 Welding and gas-electric vertical welding, for the former, the gap is required to be 5-8 mm, and the ultra-wide groove gap is used on-site with the "long meat" (groove surfacing) process, and the groove is trimmed to the standard gap (10 mm) after surfacing welding. ㎜ or less), its production efficiency is greatly reduced

For welds with ultra-wide gaps, if the welding is performed directly, the bottom weld bead will produce serious segregation and inclusions due to the influence of the ceramic liner, and even macroscopic cracks

When the gap is 12mm, the surface of the back weld is poorly formed, and the excessive slag crust causes hot metal pressure, resulting in under-welding. In addition, the overheated weld melts the deep ceramic liner, and the back weld is poorly formed. dark gray

For the latter, the gas-electric vertical welding gap is required to be no more than 8mm. When the gap reaches 12mm, due to the large energy of the welding line, the heat-affected zone of the weld will produce thermal strain embrittlement, that is, the impact toughness of the heat-affected zone cannot meet the requirements, and many Shipyards are therefore restricted from using

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