Welding process for straight seam welded pipe

A technology of straight seam welded pipe and welding process, which is applied in the direction of welding equipment, manufacturing tools, tubular objects, etc., which can solve the problems of unsatisfactory welding quality, long welding operation time, and heavy welding workload, so as to avoid weld spatter or welding Parts are not penetrated, welding production efficiency is high, and welding speed is fast

Active Publication Date: 2018-01-05
JIANGSU TONGYU STEEL PIPE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this traditional method has a large welding workload, long welding operation time, high labor intensity and low production efficiency. At the same time, the welding quality is not ideal, the pass rate of weldments is low, and there are many defects.

Method used

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  • Welding process for straight seam welded pipe
  • Welding process for straight seam welded pipe
  • Welding process for straight seam welded pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A. Surface cleaning. The surface cleaning of the steel is to remove the oil stains, oxides and rust on the groove surface and its edge within 50mm. Specifically, surface cleaning is to use an angle grinder to polish and polish the rust and oxides on the steel plate to expose the metallic luster of the steel plate, and then use acetone solution to remove oil stains on the steel plate.

[0071] B. Groove processing. The steel plate is beveled to obtain a rolled steel plate.

[0072] C. Preheat treatment. Perform preheating treatment on the coiled steel plate, wherein the preheating range of the preheating treatment is based on the center line of the groove, and the two sides are not less than three times the wall thickness of the steel plate and not less than 100mm , and keep warm within 100mm outside the preheating range.

[0073] The preheating treatment adopts a crawler heater or a flamer for preheating, and the preheating temperature is greater than 200°C.

[007...

Embodiment 2

[0091]A. Surface cleaning. The surface cleaning of the steel is to remove the oil stains, oxides and rust on the groove surface and its edge within 50mm. Specifically, surface cleaning is to use an angle grinder to polish and polish the rust and oxides on the steel plate to expose the metallic luster of the steel plate, and then use acetone solution to remove oil stains on the steel plate.

[0092] B. Groove processing. The steel plate is beveled to obtain a rolled steel plate.

[0093] C. Preheat treatment. Perform preheating treatment on the coiled steel plate, wherein the preheating range of the preheating treatment is based on the center line of the groove, and the two sides are not less than three times the wall thickness of the steel plate and not less than 100mm , and keep warm within 100mm outside the preheating range.

[0094] The preheating treatment adopts a crawler heater or a flamer for preheating, and the preheating temperature is greater than 200°C.

[0095...

Embodiment 3

[0112] A. Surface cleaning. The surface cleaning of the steel is to remove the oil stains, oxides and rust on the groove surface and its edge within 50mm. Specifically, surface cleaning is to use an angle grinder to polish and polish the rust and oxides on the steel plate to expose the metallic luster of the steel plate, and then use acetone solution to remove oil stains on the steel plate.

[0113] B. Groove processing. The steel plate is beveled to obtain a rolled steel plate.

[0114] C. Preheat treatment. Perform preheating treatment on the coiled steel plate, wherein the preheating range of the preheating treatment is based on the center line of the groove, and the two sides are not less than three times the wall thickness of the steel plate and not less than 100mm , and keep warm within 100mm outside the preheating range.

[0115] The preheating treatment adopts a crawler heater or a flamer for preheating, and the preheating temperature is greater than 200°C.

[011...

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Abstract

The invention provides a welding process for a straight seam welded pipe, and relates to the technical field of pipeline welding. The straight seam welded pipe with five welding layers is made by welding a steel plate in a winded mode, and the welding process comprises the following steps that edge preparation is conducted on a steel plate to obtain a curled steel plate; group alignment positionedwelding is conducted on the curled steel plate and a base body of the straight seam welded pipe is formed; and the straight seam welded pipe with the five welding layers can be obtained by sequentially conducting back run welding, inner welding filling welding, inner welding cosmetic welding, outer welding filling welding and outer welding cosmetic welding on the base body of the straight seam welding pipe.

Description

technical field [0001] The invention relates to the technical field of pipe welding, in particular to a welding process for straight seam welded pipes. Background technique [0002] A691 Gr11 CL2 alloy steel pipe is American Society for Testing and Materials (ASTM), which belongs to 1.25Cr-0.5Mo series pearlitic heat-resistant steel. The domestic material similar to it is 14Cr1Mo (chrome-molybdenum heat-resistant steel). The material has good high-temperature strength, oxidation resistance and sulfide corrosion resistance below 500°C, and is widely used in coal chemical, petrochemical high-temperature and high-pressure pipelines, containers, ammonia synthesis reactors, hydrogenation reactors and other devices. [0003] At present, the welding of chrome-molybdenum steel pipes still adopts the traditional manual argon arc welding method for bottoming, and electrode arc welding for filling and covering. However, this traditional method has a large welding workload, long weldin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02B23K9/18B23K9/235B23K9/025B23K101/06
Inventor 唐群崔万年唐棣华
Owner JIANGSU TONGYU STEEL PIPE GRP
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