Welding operation method for transition layer and composite layer of composite steel plate

Abstract

The invention discloses a welding operation method for a transition layer and a composite layer of a composite steel plate. The method is used for a vertical welding seam of a cylinder body and an upward slope welding seam of a spherical seal head, according to the groove type, a base layer side V-shaped groove is formed, wherein the stripping width of each side of the composite layer is not lessthan 12mm; the transition layer is welded by a sectional transverse welding method, the width of the stripped welding seam is 25mm or more, and transverse welding is carried out from one side to the other side of the groove; the welding seam is divided into 150-200mm small sections, transverse welding is carried out at the first section for one time, after arc stopping, the lower part of the second section is transversely welded for one time, and 4-6 sections are continuously welded; then a second cycle is carried out until welding is finished; the next section of welding seam is divided intoa plurality of 150-200mm sections, the next cycle is carried out till the transition layer is welded; and the process is repeated for cosmetic welding till welding is finished. The welding difficultyis reduced, and the working rate, the construction efficiency and the welding beating qualification rate are improved; and the welding rod length waste and heat input are reduced, the dilution rate ofalloy elements is low, and the welding seam is uniform in structure and excellent in performance.

Description

technical field [0001] The invention relates to the field of welding operation technology, in particular to a welding operation method for a transition layer and a cladding layer of a composite steel plate. Background technique [0002] With the upgrading of oil refining and chemical equipment, the demand for materials such as high corrosion resistance, low temperature resistance, high alloy stainless steel products and nickel-based alloys continues to increase. At the same time, if a large number of high corrosion resistance alloys are used, production costs will increase and corrosion resistance The waste of alloy materials, the traditional single material has been difficult to meet the needs of the development of refining and chemical equipment. On the basis of satisfying the service performance, the bimetal clad steel has greatly reduced the manufacturing cost, and has obvious advantages in both performance and cost. It has been more and more widely used in petrochemical...

AI Technical Summary

Problems solved by technology

[0002] With the upgrading of oil refining and chemical equipment, the demand for materials such as high corrosion resistance, low temperature resistance, high alloy stainless steel products and nickel-based alloys continues to increase. At the same time, if a large number of high corrosion resistance alloys are used, production costs will increase and corrosion resistance The waste of alloy materials, the traditional single material has been difficult to meet the needs of the development of refining and chemical equipment

On the basis of satisfying the service performance, the bimetal clad steel greatly reduces the manufacturing cost, and has obvious advantages in both performance and cost. It is more and more widely used in petrochemical equipment, but at the same time it also increases the difficulty of welding construction.

[0003] The groove type of cladding peeling is beneficial to control the composition of the transition layer and cladding layer, and ensure the corrosion resistance of the side in contact with the corrosive medium, but increases the welding workload

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