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Submerged arc welding method of steel plate

A welding method and steel plate technology, applied in welding equipment, arc welding equipment, applications, etc., can solve problems such as difficult to achieve, increase, and decrease in heat input

Active Publication Date: 2015-11-25
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, in order to increase the toughness of the welded part, it is necessary to simultaneously reduce the input heat input and increase the penetration depth, and although various proposals have been made, it is still difficult to achieve
[0006] For example, in the above-mentioned Patent Document 2, a submerged arc welding method in which the current density is increased according to the electrode diameter (electrode diameter) is proposed to increase the penetration depth, but the current and the current density are insufficient compared to the recent method, And it is difficult to make a large reduction in heat input and an increase in penetration depth coexist

Method used

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  • Submerged arc welding method of steel plate
  • Submerged arc welding method of steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The steel plate 1 for UOE steel pipes having the chemical composition (chemical composition) shown in Table 1 with a plate thickness of 28, 33, and 38.1 mm was implemented. figure 1 Groove machining (groove machining) of the groove shape shown in Table 3 was performed, and then multi-electrode submerged arc welding of inner and outer single-layer welding was performed under the welding conditions shown in Table 3 to produce welded joints. It should be noted that the groove dimensions are shown in Table 2.

[0067] Collect a Charpy impact test piece (No. 4 test piece specified in JISZ3111) from the produced joint, and perform a Charpy impact test (notch position: FL, test temperature: -30°C) based on the metal material impact test method of JISZ2242, and find Absorbed energy (average of 3 roots).

[0068] image 3 The collection position of the Charpy impact test piece 2 is shown. The FL5 of the welded part 4 is taken as the notch position, and the notch 3 is parallel...

Embodiment 2

[0074] according to figure 1 For the groove shape shown, the steel plate having the plate thickness and composition shown in Table 1 of Example 1 is subjected to groove processing with the groove size shown in Table 2 of Example 1, and then welded in the manner shown in Table 5. Conditions Carry out 4-electrode submerged arc welding of inner and outer single-layer welding to make welded joints.

[0075]From the produced joint, Charpy impact test pieces (No. 4 specified in JIS Z3111) were collected in the same manner as in Example 1 so that the position 7 mm below the surface of the steel plate on the side of the steel plate 1 welded on the inner surface or the outer welded side was the center of the Charpy test piece. Test piece) was subjected to a Charpy impact test (notch position: FL, test temperature: -30°C, test number: 3) based on the metal material impact test method of JISZ2242, and the absorbed energy (average value) was obtained. In addition, the notch position 3: F...

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Abstract

Provided is a submerged arc welding method for a steel plate which is preferably used in making and welding a large diameter pipe such as a UOE steel pipe or a spiral steel pipe. As specific means, in welding the steel plate from an internal surface or an external surface by a submerged arc welding, welding condition is set such that, a cross-sectional area of internal weld metal S 1 and a cross-sectional area of external weld metal S 2 satisfy the formula (1), the formula (2), and the formula (3), that is, 0.40‰¤(S1+S2) / t 2 ‰¤0.80 ...... (1), S 1 / t 2 ‰¤0.35 ...... (2), and S 2 / t 2 ‰¤0.45 ...... (3), wherein t: a plate thickness of the steel plate (mm), S 1 : a cross-sectional area of the internal weld metal (mm 2 ) excluding the cross-sectional area of a portion of the internal weld metal overlapping with the external weld metal after external welding, and S 2 : a cross-sectional area of the external weld metal (mm 2 ).

Description

technical field [0001] The present invention relates to a submerged arc welding method for steel plates. The submerged arc welding method for steel plates is suitable for welding large diameter steel pipes such as UOES steel pipes and spiral steel pipes during pipe making. Background technique [0002] Submerged arc welding with more than two electrodes is suitable for welding (seam welding) of large-diameter steel pipes. ) is welded and the outer side (external side) is welded with one bead, which is a high-efficiency welding construction of double-sided single-layer welding (double one layer welding) (for example, patent documents 1 and 2). [0003] In double-sided single-layer welding, it is necessary to overlap the inner weld metal with the outer weld metal and ensure sufficient depth of fusion without unmelted parts. Therefore, 1000A is usually used The above high current (large-current) is welded, but due to the emphasis on welding efficiency and defect suppression, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/18B23K9/025B23K101/06
CPCB23K9/18B23K9/0253B23K33/006B23K2201/06B23K2201/10B23K2203/04B23K2101/06B23K2101/10B23K2103/04
Inventor 石神笃史大井健次早川直哉
Owner JFE STEEL CORP
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