Welding wire special for high-strength steel penstock submerged-arc welding

A technology of submerged arc welding and high-strength pressure, applied in the direction of welding medium, welding equipment, welding equipment, etc., to achieve the effect of satisfactory welding process adaptability and easy promotion

Inactive Publication Date: 2014-11-26
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, 80kg grade hydroelectric pressure steel pipes have gradually replaced 60kg grade pressure steel pipes, and hydroelectric pressure steel pipes made of 100kg grade steel plates are in the design stage. The bottleneck restricting the application of 100kg grade hydroelectric pressure steel pipes is the lack of submerged arc welding wire and flux for 100kg grade steel plates.

Method used

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  • Welding wire special for high-strength steel penstock submerged-arc welding

Examples

Experimental program
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Effect test

Embodiment 1

[0019] The special welding wire for high-strength pressure steel pipe submerged arc welding adopts a diameter of 4mm, and its composition: 0.11%C, 0.25%Si, 2.0%Mn, 3.0%Ni, 0.15%Cr, 0.6%Mo, 0.03%Al, 0.04%Nb, 0.04%V, 0.15% Ti, 0-0.005B, 0.0025% O, 0.004% N, 0.004% S, 0.008% P, and the rest is Fe.

[0020] Flux composition used in submerged arc welding: 10.0% CaO, 18.0% MgO, 30.0% CaF 2 ,4.0%Na 2 O, 2.0% K 2 O, 1.0% MnO, 0.4% FeO, 21% SiO 2 ,11.0%Al 2 o 3 , 1.0% TiO 2 ,0.03%ZrO 2 .

[0021] A 30mm thick Q890 steel plate is used, and the test plate is opened with an asymmetrical X-shaped groove. The groove is as follows: figure 1 As shown, the size of the steel plate is 600mm×200mm×30mm, leaving 2mm blunt edge and leaving no gap between the two plates.

[0022] The 30mm+30mm thick Q890 steel plate is preheated to 120°C before welding, and the interlayer temperature is controlled at 160-180°C. Before welding, the groove is polished with a grinder to see the light, and subm...

Embodiment 2

[0026] The special welding wire for high-strength pressure steel pipe submerged arc welding adopts a diameter of 4mm, and the welding wire composition: 0.11%C, 0.25%Si, 2.0%Mn, 3.0%Ni, 0.15%Cr, 0.6%Mo, 0.03%Al, 0.04%Nb, 0.04%V , 0.15% Ti, 0~0.005B, 0.0025% O, 0.004% N, 0.004% S, 0.008% P, and the rest is Fe.

[0027] Flux composition used in submerged arc welding: 10.0% CaO, 18.0% MgO, 30.0% CaF 2 ,4.0%Na 2 O, 2.0% K 2 O, 1.0% MnO, 0.4% FeO, 21% SiO 2 ,11.0%Al 2 o 3 ,1.0%TiO 2 ,0.03%ZrO 2 .

[0028] A 30mm thick Q890 steel plate is used, and the test plate is opened with a V-shaped groove. The groove is as follows: figure 2 As shown, the size of the steel plate is 600mm×200mm×20mm, leaving 2mm blunt edge and leaving no gap between the two plates.

[0029] The 20mm+20mm thick Q890 steel plate is preheated to 100°C before welding, and the interlayer temperature is controlled at 160-180°C. Before welding, the groove is polished with a grinder to see the light, and subme...

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Abstract

The invention discloses a welding wire special for high-strength steel penstock submerged-arc welding and belongs to the field of welding materials. The welding wire comprises, by weight, 0.08%-0.2% of C, 0.1%-0.3% of Si, 1.5%-2.5% of Mn, 1.5%-3.5% of Ni, 0%-0.5% of Cr, 0.5%-1.0% of Mo, 0%-0.05% of Al, 0%-0.2% of Nb, 0%-0.2% of V, 0%-0.2% of Ti, 0%-0.01% of B, 0%-0.005% of O, 0%-0.01% of N, 0%-0.01% of S, 0%-0.01% of P, and the balance Fe and inevitable impurity elements. The welding wire is matched with a hydroelectric steel penstock made of a 100kg-grade steel plate, and when the welding wire is matched with alkaline welding flux, the requirements of a welded joint of the hydroelectric steel penstock made of the 100kg-grade steel plate that welded joint tensile strength is higher than or equal to 950 MPa, minus 60 DEG C ballistic work is higher than or equal to 47 J and 0 DEG C ballistic work is higher than or equal to 100 J can be met.

Description

technical field [0001] The invention belongs to the field of welding materials, and in particular relates to a special welding wire for submerged arc welding of high-strength pressure steel pipes, which is suitable for submerged arc welding of hydraulic pressure steel pipes made of 100kg steel plates. Background technique [0002] Hydroelectric pressure steel pipes are usually used after submerged arc welding. With the increase of hydropower installed capacity and the continuous advancement of the reduction process, the strength level of steel used for hydroelectric pressure steel pipes continues to increase. The hydroelectric pressure steel pipe is used in a harsh environment and works under repeated impact loads for a long time. In order to ensure the safety of the pressure steel pipe, it is required to have sufficient crack arrest performance. In view of the inverse relationship between the strength of the steel plate and the crack arrest performance, the quality grade of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K9/18
CPCB23K35/3066B23K9/186B23K35/0261B23K35/3605B23K35/362B23K2101/06C22C38/001C22C38/002C22C38/02C22C38/06C22C38/18C22C38/40C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 张熹牟淑坤章军金茹陈延清郭占山刘宏董现春鞠建斌张楠王凤会
Owner SHOUGANG CORPORATION
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