Manufacturing Process

The manufacturing process for welded and drawn tubing initiates with a cold-rolled sheet or strip produced in coils. The coils strips are shaped into a tube form and subjected to welding, where a fusion juncture is created by melting the edges of the open seam without the use of filler material or flux. Cold drawing follows, involving pulling the tubing through a die to attain the desired size while maintaining a uniform wall thickness. The cold drawing process is repeated, and to prevent a reduction in ductility, the tubing is annealed between drawing operations. The welded area, despite being detectable only through etching or microscopic examination, becomes homogeneous with the parent metal. Finally, the fine tubes undergo bright annealing in specialized furnaces imported from Japan, relieving stresses and maintaining corrosion resistance by preventing oxidation and loss of chromium. The advantages of this process include precise thickness control, visual detection of surface defects before welding, and cost-effectiveness compared to seamless tubing.

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