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Double-wire and double-arc submerged arc welding technology free of back gouging for plates of moderate thickness

A technology of root cleaning and submerged arc welding, which is applied in the direction of arc welding equipment, manufacturing tools, welding equipment, etc., can solve the problems affecting the health of welding personnel, polluting the production site environment, consuming man-hours and welding materials, etc., and achieve saving welding material, reduction of welding process, and improvement of welding efficiency

Inactive Publication Date: 2017-08-18
AOTAI ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The double-sided submerged arc welding process of back root cleaning generally adopts double-sided multi-layer and multi-pass welding methods. Although the welding quality can be guaranteed, the back carbon arc gouging root cleaning process not only consumes man-hours and welding materials, but also takes a lot of time in carbon arc gouging. During the process, a large amount of smoke, harmful gas and noise up to 90-120 decibels are generated, which seriously pollutes the production site environment and affects the health of welding personnel. The welding efficiency is low, the working environment is deteriorated, the labor intensity of workers is high, and the production cost is increased.

Method used

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  • Double-wire and double-arc submerged arc welding technology free of back gouging for plates of moderate thickness
  • Double-wire and double-arc submerged arc welding technology free of back gouging for plates of moderate thickness
  • Double-wire and double-arc submerged arc welding technology free of back gouging for plates of moderate thickness

Examples

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Embodiment 1

[0037] A double-wire double-arc submerged arc welding process for medium and thick plates without root cleaning, the steps are as follows:

[0038] (1) Groove preparation: process two Q345R steel plates with a thickness of 26mm into a Y-shaped groove with a groove angle α=80°, a groove depth h=6mm, and a blunt edge size c=20mm, such as figure 2 shown;

[0039] (2) Assembly preparation: assemble the two plates, and adjust the groove gap to b=0mm;

[0040] (3) Assembly process: fixed welding is carried out on the back side, and arc strike plates are added to both ends of the steel plate after fixed welding;

[0041] (4) Preparation before welding: Welding with double welding wires, the front wire is DC and the rear wire is AC power welding: the front wire is DC reverse connection, the rear wire is AC power supply, the front wire is 10°~15° forward, and the rear wire is 10°~15° backward. °, the distance between the front and rear wires is 10-15mm, and the front and rear wires ...

Embodiment 2

[0054] A double-wire double-arc submerged arc welding process for medium and thick plates without root cleaning, the steps are as follows:

[0055] (1) Groove preparation: Process two Q245R steel plates with a thickness of 32mm into an upper groove angle α=80°, a lower groove angle β=80°, and an upper groove depth h 1 =6mm, down bevel depth h 2 =6mm, double V-shaped groove with groove blunt edge size c=20mm, such as Figure 5 shown;

[0056] (2) Assembly preparation: assemble the two plates, and adjust the groove gap to b=0mm;

[0057] (3) Assembly process: fixed welding is carried out on the back side, and arc strike plates are added to both ends of the steel plate after fixed welding;

[0058] (4) Preparation before welding: Welding with double welding wires, the front wire is DC and the rear wire is AC power welding: the front wire is DC reverse connection, the rear wire is AC power supply, the front wire is 10°~15° forward, and the rear wire is 10°~15° backward. °, the...

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Abstract

The invention discloses a double-wire and double-arc submerged arc welding technology free of back gouging for plates of moderate thickness. The technology comprises the steps of groove preparing, assembly preparing, preparing before welding, front welding and back welding. In the step of groove preparing, corresponding groove types are designed for two steel plates to be welded according to the thickness of the plates, and machining is carried out; in the step of assembly preparing, the two plates are paired, and the groove gap is adjusted to reach the specified assembly gap; in the step of preparing before welding, front and back wire welding power sources are selected, front and back wire angles are adjusted, and the welding wire distance is adjusted; in the step of front welding, the front welding procedure is carried out according to the set welding technology; and in the step of back welding, the back welding procedure is carried out according to the set welding technology without back gouging for groove back sides. According to the technology, the characteristics of welding parameters of double-wire and double-arc submerged arc welding to welding line formation are reasonably utilized, the welding currents, the welding voltages, the walking speeds, the distance between two wires, the angles of the two wires and the like of the double wires and double arcs are reasonably matched, the flaw detection qualification rate and the mechanical performance of welding lines are ensured while the technology steps are reduced, the welding time and the welding material are saved, and the welding efficiency is improved by 5 times or above.

Description

technical field [0001] The invention relates to a welding process, in particular to a double-wire double-arc submerged arc welding process for 26-40mm medium and thick plates free of root cleaning. Background technique [0002] With the increasing number of various high-pressure and ultra-high-pressure pressure vessel equipment, higher requirements are put forward for welding medium-thick-wall pressure vessels in terms of welding efficiency and quality. Among them, due to its wide application, the continuous innovation of its welding technology has always been the development trend of the industry. Y-shaped, X-shaped, U-shaped and double-U-shaped grooves are mostly used for medium and thick plates. Traditional medium and thick plate welding is divided into manual welding for backing, front submerged arc welding, reverse carbon arc gouging and root cleaning, There are four steps of submerged arc welding on the reverse side, and the purpose of root cleaning on the back side i...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K9/235B23K33/00
CPCB23K9/18B23K9/235B23K33/004
Inventor 吕仲光曹文辉张光先孙润生刘汉阳李敏沈英马维丽许虹宋满堂
Owner AOTAI ELECTRIC