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Method for detecting temperature of high-strength Cr-Mo steel double-side welding back gouging groove belt

A detection method and high-strength technology, applied in welding equipment, auxiliary welding equipment, welding/cutting auxiliary equipment, etc., can solve problems such as poor welding quality and poor magnetic particle detection effect, avoid adverse effects, facilitate fine processing, The effect of welding and root cleaning quality assurance

Active Publication Date: 2014-09-17
SICHUAN KEXIN MECHANICAL & ELECTRICAL EQUIPCO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to: aim at the above-mentioned problems, to provide a high-strength Cr-Mo steel double-sided welded root cleaning groove band temperature detection method, so that it can be judged at the band temperature whether the groove surface after root clearing meets the following conditions: Process requirements, effectively solve the problems that multiple temperature rises and falls are unfavorable to welding quality and poor magnetic particle inspection results, reduce the weld repair rate of thick chrome-molybdenum steel plates, improve the pass rate of welding once, save energy and reduce consumption, and shorten the product manufacturing cycle

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  • Method for detecting temperature of high-strength Cr-Mo steel double-side welding back gouging groove belt
  • Method for detecting temperature of high-strength Cr-Mo steel double-side welding back gouging groove belt
  • Method for detecting temperature of high-strength Cr-Mo steel double-side welding back gouging groove belt

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Effect test

Embodiment 1

[0049] Embodiment 1, high-strength Cr-Mo steel double-sided welding root cleaning groove temperature detection method, such as figure 1 As shown, the Cr-Mo steel plate Ⅰ1 and steel plate Ⅱ2 with a thickness of 80mm are processed, so that the blunt edge 3 of the groove of the steel plate Ⅰ1 and the steel plate Ⅱ2 are butted together to form a double U-shaped groove symmetrical to the blunt edge 3 of the groove. The thickness of the blunt edge 3 of the groove is 5 mm, and it is located at the 1 / 2 thickness (40 mm) of the Cr-Mo steel. The circular curvature R of the U-shaped groove is 8 mm. The gap between the blunt edge 3 of the steel plate groove is 0mm; the width L of the U-shaped groove should at least be able to satisfy the welding head of the submerged arc welding machine to freely extend into the groove for welding to ensure the quality of automatic welding; the double U formed after the butt joint Preheat the U-shaped groove to 200°C, and then use a single-sided multi-lay...

Embodiment 2

[0050] Embodiment 2, high-strength Cr-Mo steel double-sided welding root cleaning groove temperature detection method, such as figure 1 As shown, the Cr-Mo steel plate Ⅰ1 and steel plate Ⅱ2 with a thickness of 100 mm are processed, so that the blunt groove edge 3 of the steel plate Ⅰ1 and steel plate II 2 is butted together to form a double U-shaped groove symmetrical to the blunt edge 3 of the groove. The thickness of the blunt edge 3 of the groove is 5.5mm, and it is located at the 1 / 2 thickness (50mm) of the Cr-Mo steel. The circular curvature R of the U-shaped groove is 10mm, and the two steel plates are assembled by using the assembly tool 4, The gap between the blunt sides 3 of the two steel plate grooves is 0.5mm; the U-shaped slope width L should at least be able to satisfy the welding head of the submerged arc welding machine to freely extend into the groove for welding to ensure the quality of automatic welding; Preheat the U-shaped groove to 220°C, and then use a si...

Embodiment 3

[0051] Embodiment 3, high-strength Cr-Mo steel double-sided welding root cleaning groove temperature detection method, such as figure 1 As shown, the Cr-Mo steel plate Ⅰ1 and steel plate Ⅱ2 with a thickness of 120 mm are processed, so that the blunt edge 3 of the groove of the steel plate Ⅰ1 and the steel plate Ⅱ2 are butted together to form a double U-shaped groove symmetrical to the blunt edge 3 of the groove. The thickness of the blunt edge 3 of the groove is 6mm, and it is located at the 1 / 2 thickness (60mm) of the Cr-Mo steel. The circular curvature R of the U-shaped groove is 12mm. The gap between the blunt edge 3 of the steel plate groove is 1 mm; the width L of the U-shaped slope should at least be able to satisfy the welding head of the submerged arc welding machine to freely extend into the groove to ensure the quality of automatic welding; the double U-shape formed after the butt joint The groove is preheated to 250°C, and then one side of the U-shaped groove is wel...

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Abstract

The invention discloses a method for detecting the temperature of the root-clearing groove of high-strength Cr-Mo steel double-sided welding, which belongs to the technical field of welding and detection. The invention can judge whether the groove meets the requirements after root cleaning when the root cleaning temperature of Cr-Mo steel is greater than 200°C, and cleverly solves the problem of temperature drop detection in the existing technology, and the process improvement brought by it is effectively It solves the adverse effects of multiple temperature rises and falls on the welding quality during welding, improves the first pass rate of welding, and also solves the manufacturing problem of slow welding speed of high-strength Cr-Mo steel.

Description

technical field [0001] The invention belongs to the technical field of welding and detection, and relates to a method for detecting the temperature of a double-sided welded groove of high-strength steel, in particular to a detection method for the temperature of a double-sided welded groove of high-strength Cr-Mo steel. Background technique [0002] Steel materials used for hydrogen-facing equipment in oil refining and chemical plants need to have excellent hydrogen corrosion resistance and good high-temperature strength. Therefore, thick Cr-Mo steel plates are often used for high-temperature and high-pressure vessel shells and heads. However, Cr-Mo steel (chrome-molybdenum steel) is a steel type with high strength, large hardening tendency, and easy to produce hydrogen-induced cracks (that is, commonly called delayed cracks). [0003] The thick Cr-Mo steel plate needs to use double-sided welding to ensure full penetration. After welding on one side, the back root cleaning ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K37/00B23K33/00
Inventor 孙双前邹生智李锡伟谢华春
Owner SICHUAN KEXIN MECHANICAL & ELECTRICAL EQUIPCO
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