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A Welding Method for Oscillating Arc Narrow Gap Single-sided Welding and Double-sided Forming

A single-sided welding double-sided, welding method technology, applied in arc welding equipment, welding equipment, workpiece edge parts and other directions, can solve the problems of low welding efficiency, expensive welding equipment, etc., to achieve high welding efficiency, low implementation cost, welding The effect of low heat input

Active Publication Date: 2015-09-16
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems and defects of low welding efficiency and expensive welding equipment, which are difficult to meet the welding needs of thick plate high-strength steel in the above-mentioned current single-side welding and double-side forming process, and use the shaking arc narrow gap melting electrode gas shielded welding method Advantages in the manufacture of thick plate high-strength steel components, a welding method with low implementation cost, good applicability, and high welding efficiency of shaking arc narrow gap single-sided welding and double-sided forming is proposed

Method used

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  • A Welding Method for Oscillating Arc Narrow Gap Single-sided Welding and Double-sided Forming
  • A Welding Method for Oscillating Arc Narrow Gap Single-sided Welding and Double-sided Forming
  • A Welding Method for Oscillating Arc Narrow Gap Single-sided Welding and Double-sided Forming

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Experimental program
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Effect test

Embodiment 1

[0042] figure 2 Shown is the groove gap G = 12mm, and the back weld shape after rooting welding at different root gaps g, where, figure 2 (a) is the back weld formation when the root gap g=4mm, at this time the blunt edge thickness t 1 = 2mm, the width of the forming groove 10 of the liner 9 is 8mm, the arc shaking frequency set corresponding to rooting welding is 0.5Hz, the arc shaking amplitude is 35°, the arc stay time on the side wall is 200ms, and the average welding current is 220A, The average arc voltage is 26V, the welding speed is V w 13.5cm / min; figure 2 (b) is the back weld formation when the root gap g=6mm, at this time the blunt edge thickness t 1 = 1.5mm, the width of the forming groove 10 of the liner 9 is 10mm, the corresponding arc shaking frequency is 1.0Hz, the arc shaking amplitude is 66°, the residence time of the arc on the side wall is 150ms, and the average welding current is 200A , the average arc voltage is 24V, the welding speed is V w 10.5c...

Embodiment 2

[0045] image 3 Shown is a macroscopic photo of the shaking arc narrow gap single-sided welding and double-sided forming welded joints of 20mm thick ordinary strength steel at different groove gaps G. for pure CO 2 gas.

[0046] in, image 3 (a) is a macroscopic photo of the shaking arc narrow gap single-sided welding and double-sided forming welding joint when the groove gap G=8mm. At this time, the root gap g=6mm and the blunt edge thickness t 1 =1mm, the width of the forming groove 10 of the liner 9 is 10mm, the corresponding arc shaking frequency set for root welding is 1.0Hz, the arc shaking amplitude is 66°, the arc stay time on the side wall is 150ms, and the average welding current is 180A , the average arc voltage is 22V, the welding speed is V w 9.5cm / min; the arc shaking frequency set for filling welding is 3.5Hz, the arc shaking amplitude is 50°, the arc stays on the side wall for 40ms, the average welding current is 260A, the average arc voltage is 26.5V, and ...

Embodiment 3

[0051] Figure 4 Shown is a macroscopic photo of the oscillating arc narrow gap single-sided welding and double-sided forming welded joints of high-strength steel with a thickness of 50 mm at different groove gaps G. Designed for the root gap g = 7mm, blunt edge thickness t 1 =1mm, and all use the liner 9 that the width of the forming groove 10 is 14mm, and the shielding gas 6 is that the composition is Ar80%+CO 2 of mixed gas.

[0052] in, Figure 4 (a) is a macroscopic photo of the shaking arc narrow gap single-sided welding and double-sided forming welding joint when the groove gap G=12mm. The corresponding arc shaking frequency is set to 1.5Hz and the arc shaking amplitude is 76° for backing welding. The residence time of the arc on the side wall is 100ms, the average welding current is 180A, the average arc voltage is 22V, and the welding speed is V w 9.5cm / min; the arc shaking frequency set for filling welding is 2.8Hz, the arc shaking amplitude is 70°, the arc stay ...

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Abstract

The invention discloses a welding method for arc-rocking narrow-gap one-side welding with back formation. The method comprises the steps that firstly, metal thick-plate workpieces are assembled to form a horizontal-position U-shaped groove to be welded, wherein the groove gap is 8 mm-16 mm, the root gap is 4 mm-8 mm, and the root face height is 0 mm-2 mm, and the reverse side of the groove is provided with a liner with a formed groove; according to the plate thickness and the welding level, the inflating mode of protective gas is selected, and the arc-rocking frequency, the arc-rocking amplitude value, the arc stay time on a side wall, the average welding current, the average arc voltage and the welding speed of backing welding, filling welding and cosmetic welding are respectively set; finally, under the support of the liner on the reverse side of a welding seam, automatic welding for arc-rocking narrow-gap one-side welding with back formation is achieved. According to the welding method, the groove is simple in form and easy to machine, process applicability and welding efficiency are high, welding seam formation is beautiful, a welding joint has good performance, implementation cost is low, and practicability is high.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a welding method for single-sided welding with narrow gap and double-sided forming by shaking electric arc. Background technique [0002] The single-sided welding and double-sided forming process is a welding method that only needs to be welded on one side of the workpiece, and the front and back sides are formed at the same time. It has been widely used in the manufacturing fields of ships and ocean engineering, boiler pressure vessels, and heavy machinery. At present, most single-side welding and double-side forming processes usually adopt the existing arc welding method, and use the supporting effect of the forming liner on the back of the welding groove to the molten pool to realize root welding, filling welding and capping of the workpiece groove weld. Using this process can save the workpiece turning process, and does not need to carry out back weld cleaning a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/173B23K9/235
CPCB23K9/035B23K9/173B23K9/235B23K33/00B23K2101/185
Inventor 朱杰杨茂森王加友马敏
Owner JIANGSU UNIV OF SCI & TECH
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