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Straight welded joint crack sensitivity evaluation method and multivariant restraining plate for evaluating

A technology of crack sensitivity and evaluation method, which is applied in the field of cold crack sensitivity evaluation of pipeline steel plate and pipe welding, can solve the problem of cold crack sensitivity of crack sensitive welding that has not yet been found, and achieve the effect of enhancing the restraint effect.

Inactive Publication Date: 2014-07-16
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, no technology and evaluation method have been found that can directly reflect the crack sensitivity under the welding conditions of pipeline steel plate pipes, especially the sensitivity to welding cold cracks

Method used

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  • Straight welded joint crack sensitivity evaluation method and multivariant restraining plate for evaluating
  • Straight welded joint crack sensitivity evaluation method and multivariant restraining plate for evaluating
  • Straight welded joint crack sensitivity evaluation method and multivariant restraining plate for evaluating

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Embodiment 1

[0086] Figure 1 and figure 2 shown.

[0087] Large-caliber longitudinal submerged arc welding pipe welding mainly includes high-speed melting electrode gas shielded pre-welding and double-sided inner and outer multi-wire submerged arc welding. When it is necessary to evaluate the crack sensitivity in the pre-welding process of pipeline steel plate pipe, apply the same welding process as that of on-site pipe making, and carry out a melting electrode gas shielded welding on the multi-component restraint plate of the present invention. After welding is completed 24 hours The pipeline steel plate 3 to be evaluated is removed from the multi-component restraint plate, and the welding crack sensitivity under the condition of on-site pipe pre-welding is evaluated by means of ultrasonic non-destructive testing and macroscopic and microscopic crack inspection.

[0088]When it is necessary to evaluate the crack sensitivity in the internal and external submerged arc welding process of th...

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Abstract

The invention discloses a straight welded joint crack sensitivity evaluation method and a multivariant restraining plate for evaluating, applied to a process of producing a large-diameter longitudinal submerged arc welded pipe by a pipeline steel plate, particularly applied to evaluating welding cold crack sensitivity of the pipe made of the pipeline steel plate under large restraint. The multivariant restraining plate comprises a lower restraining base plate (1) and an upper restraining sleeve plate (2), wherein the upper restraining sleeve plate (2) covers on the lower restraining base plate, and the upper restraining sleeve plate is used for clamping and restraining the pipeline steel plate to be evaluated between the lower restraining base plate and the upper restraining sleeve plate, and enabling the welding groove of the pipeline steel plate to be evaluated to be positioned at a welding position between the lower restraining base plate and the upper restraining sleeve plate. The method comprises the steps of: prewelding under the protection of high-speed melting polar gas, machining a double-Y-shaped groove with a thick truncated edge on the pipeline steel plate to be evaluated for welding; placing for more than 24 hours after the welding is completed, performing non-destructive testing to the welded joint by using a manual ultrasonic non-destructive testing device with an angular sensor, and evaluating. According to the straight welded joint crack sensitivity evaluation method and the multivariant restraining plate for evaluating, the actual situation when a large-diameter longitudinal submerged arc welded pipe is welded can be comprehensively reflected.

Description

technical field [0001] The invention relates to a technology for evaluating the sensitivity of welding cracks in the process of preparing straight seam submerged arc welded pipes from pipeline steel plates, especially the technology for evaluating the sensitivity of cold cracks in welding cold cracks of pipeline steel plates under relatively restrained conditions. The present invention designs multi-element restraint plates including restraint bottom plates and restraint sleeve plates, etc., and conducts welding cold crack sensitivity evaluation for relatively large-scale pipeline steel plates for pipe making, from the dimensions of welding test plates, restraint conditions, welding joint design, welding process Methods and specifications, etc., comprehensively reflect the actual situation of large-diameter longitudinal welded pipe welding. The invention can also be used to evaluate the welding crack sensitivity when different kinds of welding material combinations, welding pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/12
CPCB23K31/125B23K9/0253B23K9/18
Inventor 刘硕钱伟方王怀龙白岩曹能
Owner BAOSHAN IRON & STEEL CO LTD
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