Single edge groove submerged arc welding technique of plate with moderate thickness

A welding process and submerged arc welding technology, which is applied in the field of submerged arc welding of medium and heavy plates with single edge grooves, can solve the problems of easy slag inclusion, large welding residual stress in welded joints, and difficulty in molten pool, and save welding materials. , Reduce welding man-hours, solve the effect of welding methods

Inactive Publication Date: 2012-08-15
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If fully submerged arc welding is used, due to the small angle at the bottom of the unilateral "レ"-shaped groove, it is difficult to form a molten pool, and it is easy to cause incomplete penetration; the angle at the root of the groove is too narrow, and there is a large welding residual stress in the welded joint. After the weld seam shrinks, it is difficult to remove the welding slag and it is easy to include slag and cracks; after carbon arc gouging, it is easy to produce pores, and it is difficult to control the weld shape during welding

Method used

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  • Single edge groove submerged arc welding technique of plate with moderate thickness
  • Single edge groove submerged arc welding technique of plate with moderate thickness
  • Single edge groove submerged arc welding technique of plate with moderate thickness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Implementation example 1: S460 submerged arc welding welding test.

[0014] For the schematic diagram of welding test plate group, see figure 1 .

[0015] Welding process: DC reverse connection method is adopted; φ3.2 welding wire is used for the first to third layers on the front of the weld bead, the rod elongation is 3.0cm, the current is 400A, the voltage is 24V, and the welding speed is 57cm / min; the other layers on the front of the weld bead use φ4 welding wire. Rod elongation 3.5cm, current 600A, voltage 30V, welding speed 45cm / min; after the front bead is completed, the back bead is flanged and welded, the back bead layer is made of φ4 welding wire, the rod elongation is 4.2cm, current 700A, voltage 35V, The welding speed is 36cm / min, and the average heat input is 24kJ / cm. For a schematic diagram of the weld see figure 2 , welding process parameters are shown in Table 1.

[0016] Table 1 Welding process parameters of welding test plate

[0017]

Embodiment 2

[0018] Implementation example 2: S355 submerged arc welding welding test.

[0019] For the schematic diagram of welding test plate group, see figure 1 .

[0020] Welding process: DC reverse connection method is adopted; φ3.2 welding wire is used for the first to third layers of the front side of the weld bead, the rod elongation is 3.0cm, the current is 400A, the voltage is 24V, and the welding speed is 57cm / min; the front side of the weld bead 4~12 uses φ4 welding wire , rod elongation 3.5cm, current 600A, voltage 30V, welding speed 45cm / min; weld bead front 13~55 uses φ4 welding wire, rod elongation 3.5cm, current 680A, voltage 34V, welding speed 40cm / min; front weld bead After completion, the back bead is flanged and welded, the back bead layer is made of φ4 welding wire, the rod elongation is 4.2cm, the current is 700A, the voltage is 35V, the welding speed is 36cm / min, and the average heat input is 35kJ / cm.

[0021] For a schematic diagram of the weld see image 3 , we...

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Abstract

The invention discloses a single edge groove submerged arc welding technique of a plate with moderate thickness. The technique utilizes a DC (direct current) opposition method, and comprises the following technical steps: first to third layers on the facade: a phi 3.2 welding wire is utilized, the current is 380-400A, a rod is stretched by 2.8-3.0cm, the voltage is 24-25V, and the speed is 55-57cm/min; the other layers on the facade of the welding rail: a phi 4 welding wire is utilized, the rod is stretched by 3.0-3.5cm, the current is 560-600A, the voltage is 28-30V and the speed is 45-50 cm/min, or a phi 4 welding wire is utilized, the rod is stretched by 3.8-4.0cm, the current is 650-680A, the voltage is 33-34V, and the welding speed is 38-40 cm/min; and the back surface layer: a phi 4 welding wire is utilized, the rod is stretched by 3.8-4.2cm, the current is 680-700A, the voltage is 34-35V, and the speed is 34-36 cm/min. According to the invention, the submerged arc welding is directly used for bottoming, and no back chipping is performed on the back surface of the weld, thereby solving the complex welding method of the traditional technique, guaranteeing the percent of pass of the weld flaw detection, reducing the welding time and saving the welding material.

Description

Technical field [0001] The invention belongs to the welding technology, in particular to a single-side groove submerged arc welding process for a medium-thick plate. Background technique [0002] In the current welding of unilateral groove submerged arc welding of medium and thick plates, taking the traditional unilateral "レ" shaped groove submerged arc welding of thick plates as an example, the root is made by manual arc welding or gas shielded welding, and the back of the weld is welded. Take carbon arc gouging. If fully submerged arc welding is used, due to the small angle at the bottom of the unilateral "レ"-shaped groove, it is difficult to form a molten pool, and it is easy to cause incomplete penetration; the angle at the root of the groove is too narrow, and there is a large welding residual stress in the welded joint. After cold shrinkage of the weld seam, it is difficult to remove the welding slag and it is easy to include slag and cracks; after carbon arc gouging,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18
Inventor 艾爱国邱福祥欧勇罗松云袁源
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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