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Back-gouging-free welding process for double U shaped grooves of medium-thickness plates

A welding process and groove technology, which is applied in the field of double U-shaped groove and unclear root welding process for medium and heavy plates, can solve the problems of labor consumption, carbon rod electric energy, large amount of welding metal filling, unstable welding quality, etc. Achieve the effect of saving welding materials and welding time, stable welding quality and saving welding materials

Inactive Publication Date: 2015-01-07
CHENGDU TIANBAO HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Production in this way consumes a lot of manpower, carbon rods, electric energy, large amount of weld metal filling, low production efficiency, time-consuming, cost-consuming, unstable welding quality, etc.; the use of I-type groove unclear root welding technology is only in Welding 20mm steel plate is widely used, but the scope of application is limited

Method used

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Embodiment Construction

[0015] A double U-shaped groove unclear root welding process for medium and thick plates includes: a double U-shaped groove unclear root welding process for medium and thick plates, including:

[0016] In the pre-welding assembly step, the medium and thick plates are machined to form a double U-shaped groove, the groove blunt side size is 3-8mm, and the groove gap is 1-3mm;

[0017] In the front bottom welding step, solid wire gas shielded welding is used to perform bottom welding on the front side of the groove, and the weld is not burned through during the welding process;

[0018] The front submerged arc welding step uses a small current to perform submerged arc welding on the front surface of the groove. In the front submerged arc welding step, a solid wire with a diameter of 4.0mm is used, the current is 350A-500A, and the voltage is 31V-35V , The welding speed is 350-425mm / min;

[0019] In the front filling and covering steps, a number of welds are performed on the front surface...

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Abstract

The invention discloses a back-gouging-free welding process for double U shaped grooves of medium-thickness plates. The process includes the steps: assembly before welding, front-face back welding, front-face submerged arc welding, front-face filling and covering, back-face submerged arc welding and back-face filling and covering. Front-face multi-layer welding of the grooves is performed after back-face multi-layer welding of the grooves is finished, and front faces and back faces of the grooves are adjusted at any time during welding according to groove deformation conditions until welding seams of the front faces and the back faces of the grooves are filled completely. The back-gouging-free welding process has the advantages that back-gouging-free welding of the back faces of the double U shaped grooves with different clearances can be realized, waste of manpower, material resources and financial resources due to back gouging in welding of the medium-thickness plates is avoided, welding quality is stable, and welding seams meet the requirements on I-level welding seams.

Description

Technical field [0001] The invention relates to the field of steel structure manufacturing, in particular to a double U-shaped groove unclear root welding process for medium and thick plates. Background technique [0002] Medium-thick plate structures are widely used in ship plates and shells, port machinery box beams, and cross-sea bridge panels. Thick plate butt welding is an important link in the manufacturing process of steel structures and pressure vessel products. This type of weld Traditional welding methods generally use single-sided Y, single V / U or X / double U-shaped grooves, using manual arc welding or gas shielded welding for bottoming. After the front is welded, the back is cleaned, and then the reverse is welded. Using this method to produce may consume a lot of manpower, carbon rods, and electric energy. The weld metal fills a large amount, the production efficiency is low, time-consuming, cost-consuming, and the welding quality is unstable. The use of I-shaped groo...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K9/16B23K9/235
CPCB23K9/18B23K9/095B23K9/16B23K33/004B23K2101/185
Inventor 吴召波傅华
Owner CHENGDU TIANBAO HEAVY IND
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