Flattening device for welding seam of welded pipe

Abstract

The invention relates to a flattening device for a welding seam of a welded pipe, which comprises a guide seat and a roll mounting seat arranged on the guide seat. The flattening device is characterized in that the roll mounting seat comprises a trolley which is equipped with a horizontal cylinder, a lower roll, an upper roll, an elevating cylinder connected with the upper roll and an adjusting knob connected with the lower roll; and the flattening device is further equipped with a core rod arranged in the welded pipe, a core rod fixed block fixed on the guide seat and a spring for connecting the core rod fixed block with the core rod together. In the invention, the welding seam of the welded pipe is flattened by a rolling mode to realize smooth transition between welding beads as well as welding beads and base metal after use, and performance parameters of the welding beads and the base metal have small difference, thus fully meeting the requirements for product quality; the flattening device is controlled by a PLC, thus achieving high precision; and the flattening device is provided with the adjusting knob to meet the diameter of the welded pipe within a wider range, thus achieving wide application range.

Description

technical field [0001] The invention relates to a welding seam processing device for a welded pipe, in particular to a welding seam flattening device for a welded pipe. Background technique [0002] Stainless steel welded pipes used in chemical industry, food sanitation and other industries require their welds to be flat. The Chinese Machinery Industry Standard JB / T7949-1999 "Steel Structure Weld Dimensions" clearly stipulates the width and margin of steel structure welded joints to welds. High requirements, requiring a smooth transition between the weld bead and the weld bead and the weld bead and the base metal. [0003] At present, the welded pipe weld reinforcement treatment equipment installed after the pipe making device in the stainless steel welded pipe manufacturing process usually adopts the following treatment methods: the inner wall of the welded pipe is scraped off with a special tool, and the outer side of the welded pipe is polished to remove the welded scar. ...

AI Technical Summary

Problems solved by technology

The disadvantage of using the cutting tool and polishing process is that there are unsatisfactory knife marks on the inner and outer surfaces of the processed welded pipe, which affects the quality of the welded pipe

For stainless steel welded pipes, there are metal melting and recrystallization processes at the weld in the manufacturing process, and the performance parameters such as hardness, strength, and toughness of the weld and the edge of the weld are different from those of the base metal. It is difficult to use simple polishing and knife scraping processes. Elimination of this difference will eventually lead to a decrease in product quality

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