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Large-gap back-chipping-free welding process for I-shaped groove of middle thick plate

A welding process and large gap technology, which is applied in welding equipment, plasma welding equipment, welding/welding/cutting items, etc., can solve the problems of large cutting quality assembly gap, failure to meet quality requirements, unqualified welding quality, etc., to achieve assembly The effect of large gap, high welding production efficiency and stable welding quality

Active Publication Date: 2014-05-14
SHANGHAI ZHENHUA HEAVY IND
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Problems solved by technology

Therefore, the I-type groove welding method adopted by shipbuilding enterprises: the double-sided single-pass submerged arc welding method is unqualified for I-type groove welding with low cutting quality and large assembly gaps, and cannot meet the requirements of heavy equipment enterprises. Quality Requirements for Type I Groove Unclear Root Welding

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  • Large-gap back-chipping-free welding process for I-shaped groove of middle thick plate
  • Large-gap back-chipping-free welding process for I-shaped groove of middle thick plate
  • Large-gap back-chipping-free welding process for I-shaped groove of middle thick plate

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Embodiment Construction

[0023] In view of the situation in the prior art that the plasma cutting quality of medium and thick plates is not high, there is a natural groove, the assembly gap is large, and the quality of the weld seam is required to be a first-class weld, the present invention proposes a type I groove suitable for medium and thick plates. The welding method with large gaps and unclear roots, the basic process is S-M-S (SAW-MAG-SAW), that is, solid wire gas shielded welding (MAG), front submerged arc welding (SAW), and back submerged arc welding (SAW).

[0024] refer to figure 1 As shown, the present invention discloses a welding process 100 of type I groove of medium and thick plate with large gap and unclear root, including the following steps:

[0025] 102. Cutting and pre-weld assembly steps. Use plasma to cut medium-thick plates, assemble medium-thick plates to form I-shaped grooves, the gap at the root of the groove δ is less than or equal to 3mm, and the gap at the front of the ...

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Abstract

The invention discloses a large-gap back-chipping-free welding process for an I-shaped groove of a middle thick plate. The process includes the following steps: cutting and assembling before welding, namely adopting plasma to cut the middle thick plate and assembling the middle thick plate to form the I-shaped groove, wherein root gap of the groove is smaller than or equal to 3mm, and front gap of the groove is small than or equal to 5mm; performing front back welding, namely performing back welding on the front of the groove by means of small-current oscillation welding to form a welding seam in a large gap without welding penetration; performing front cosmetic welding, namely performing cosmetic welding on the front of the groove in a small-current manner, wherein the welding seam of front back welding is not burnt through in the process of front cosmetic welding; performing back submerged arc welding, namely directly performing submerged arc welding on the back of the groove without through carbon gouging and back chipping, wherein current of back submerged arc welding enables weld penetration depth h3 of back submerged arc welding to be three fourths of thickness of the middle thick plate.

Description

technical field [0001] The invention relates to the field of steel structure manufacturing, more specifically, to the technical field of medium-thick plate welding. Background technique [0002] Medium and heavy plate structures are widely used in ship plates and shells, port machinery box girders, and decks of cross-sea bridges. Butt welding of medium and thick steel plates is an important part of steel structure production, which directly affects product quality and production efficiency. The traditional method generally adopts V-groove, front welding, back root cleaning, and then welding. The welding production efficiency is low, high energy consumption, serious environmental pollution, and high cost. There is an urgent need for a high-efficiency, low-carbon root cleaning type I A new method of groove welding, that is, a welding method that does not open a V-shaped groove and does not clear the root. [0003] At present, double-sided single-pass submerged arc welding is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/173B23K33/00
CPCB23K9/173B23K9/18B23K9/235B23K10/00B23K33/00B23K2101/185B23K2103/04
Inventor 张华军杜渝李洪明黄红雨李森包孔吴世品蔡春波陈志荣
Owner SHANGHAI ZHENHUA HEAVY IND
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