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Thick steel plate submerged arc penetration welding back-chipping-free welding method and groove structure thereof

A welding method and welding groove technology, which are applied to welding equipment, arc welding equipment, and the edge of workpieces, etc., can solve the problems of large loss, long welding time, etc., achieve good quality, high welding efficiency, save time and economic costs Effect

Active Publication Date: 2018-12-07
CHINA HUASHI ENTERPRISES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a thick steel plate submerged arc penetration welding free root cleaning method and its groove structure, to solve the problems of long time consumption and large loss in the welding of thick steel plates with a thickness of 100mm in the prior art, and to achieve reduction in the thickness of 100mm The purpose of welding time and loss of the thick steel plate within the welding, improving welding efficiency

Method used

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  • Thick steel plate submerged arc penetration welding back-chipping-free welding method and groove structure thereof
  • Thick steel plate submerged arc penetration welding back-chipping-free welding method and groove structure thereof
  • Thick steel plate submerged arc penetration welding back-chipping-free welding method and groove structure thereof

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Embodiment 1

[0039]The submerged arc penetration welding method for thick steel plates without root cleaning comprises the following steps: (a) determining the welding groove positions of two steel plates with equal thickness, and performing flaw detection on the area of ​​the two steel plates within the width range of 2t at the edge of the groove; Replace the steel plate that is defective in the flaw detection; where t is the thickness of the steel plate; (b) Cut and blank the two steel plates according to the actual size of the required component; (c) Open the butt joint groove: if t≤30mm, the butt joint groove Open as type I; if 30mm<t≤100mm, the butt joint groove is opened as reserved blunt edge X-shaped groove, where the included angle of the X-shaped groove is 40°, and the thickness of the blunt edge is 10-15mm; (d) The two steel plates and the double-wire welding machine stand in place, and then preheat the two steel plates; adjust the distance between the double wires so that the di...

Embodiment 2

[0041] Submerged arc penetration welding method for thick steel plates without root cleaning, on the basis of Example 1, in step (e), if t≤30mm, the welding speed is 50cm / min, and the assembly gap is between 0 and 2mm; if 30mm< If t≤100mm, the welding speed is 30cm / min, the assembly gap is 0, and the welding arm is adjusted horizontally to the left or right by 3-4mm after each welding seam. In the step (e), when the filling amount of the weld seam reaches 2 / 3 of the front weld seam, the step (f) is entered, and the submerged arc welding back welding is started. The step (f) includes the following steps: if t≤30mm: (A) use a sling to turn the component over, adjust the welding wire to ensure the center of the vertical weld seam; (B) bottom welding: make the front wire current 950A, voltage 32V, Welding torch angle is 0°, rear wire current is 550A, voltage is 42V, welding torch angle is 12°, and the speed of 50cm / min is used for bottom welding; The wire current is 580A, the rea...

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Abstract

The invention discloses a thick steel plate submerged arc penetration welding back-chipping-free welding method and a groove structure thereof. The method includes the steps that (a) the positions ofwelding grooves of two steel plates equal in thickness are determined, and the steel plates displayed to have defects through flaw detection are replaced, wherein t is the thickness of the steel plates; (b) the two steel plates are cut and blanked; (c) butt joint grooves are formed, wherein when t is smaller than or equal to 30 mm, the butt joint grooves are formed to be in I shapes, and when t islarger than 30 mm and smaller than or equal to 100 mm, the butt joint grooves are formed to be X-shaped grooves with reserved truncated edges; (d) the two steel plates and a twin-wire welding machineare assembled in place, and the two steel plates are preheated, wherein direct current is provided for a front wire, and alternating current is provided for a back wire; (e) submerged-arc welding front face welding is carried out; (f) submerged-arc welding back face welding is carried out; and (g) postwelding heat preservation is carried out in a heat preservation groove at the temperature ranging from 300 DEG C to 400 DEG C. The thick steel plate submerged arc penetration welding back-chipping-free welding method and the groove structure are used for solving the problem that in the prior art, the thick steel plates with the thickness smaller than 100 mm are long in time wasted for welding and large in loss, and the aims of shortening the welding time of the thick steel plates with the thickness smaller than 100 mm and improving the welding efficiency are achieved.

Description

technical field [0001] The invention relates to the field of submerged arc welding, in particular to a root cleaning-free welding method for submerged arc penetration welding of thick steel plates and a groove structure thereof. Background technique [0002] In steel structure engineering, the welding construction of thick steel plates is difficult, the workload is heavy, and the quality of welds is high. How to complete the automatic welding of thick plates with high efficiency and high quality has become a subject that the industry has been exploring. In the traditional process, for the welding of thick steel plates with a thickness of less than 100mm, the welding method combining manual carbon dioxide gas shielded welding and automatic submerged arc welding is usually used. The groove angle of the weldment is large and deep, and more welding materials are consumed. The efficiency is low, the joints need to be cleaned from the back, the weld defects are frequent, and the o...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K9/235B23K33/00
CPCB23K9/18B23K9/235B23K33/00
Inventor 卢洪刚辛帮勇周浩龙绍章曹杰刘侨
Owner CHINA HUASHI ENTERPRISES
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