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Steel Pipe: Butt-Welded Through a Bell, Sized, Threaded and Tested (National Tube Co., 1921)

National Tube Co. · Public domain (published 1921)

أنشأه

Forge

4. نوفمبر 2026

Steel Pipe: Butt-Welded Through a Bell, Sized, Threaded and Tested (National Tube Co., 1921)

Butt-weld steel pipe, 1/8 to 3 inches, as National Tube made it in 1921: hot skelp is pulled by tongs and a draw-bench chain through a bell a little larger than the finished pipe, which curls it into a tube and presses its edges together into a weld. The pipe is then rolled to size, straightened, cleaned, threaded and pressure-tested. Each length, 20 to 40 ft, is welded in one pull. Every pipe is tested inside at 700 to 800 lb per square inch. Source: National Tube Co., "National" Modern Welded Pipe (1921), pp. 41-47. Picture: drawing butt-weld pipe.

متقدم

Unknown

التعليمات

Heat the skelp

Charge the skelp from the rear into a long welding furnace, a little longer than the skelp, with a narrow opening at each end, and bring it to welding heat.

المواد لهذه الخطوة:

شريط الأنابيب الفولاذي1 one piece per length of pipe

الأدوات المطلوبة:

فرن اللحام

Draw it through the bell

Grip the trimmed end with long-handled tongs and pull it through a die, or bell, slightly larger than the finished pipe. Hook the tongs to the travelling chain of the draw bench, which pulls the whole length (20 to 40 ft) through. The skelp is a little wider than the bell's inside circumference, so it curls into a tube and its edges butt squarely and weld. Some sizes go through two bells at one heat, the second slightly smaller.

الأدوات المطلوبة:

منضدة السحب

كلّابة حدادة

فرن اللحام

For Double Extra Strong pipe

Thick skelp needs so great a pull that a strong bar is welded on its end as a 'bait' for the tongs. Draw it several times through bells of decreasing size, reheating between draws, so the seam is thoroughly welded.

الأدوات المطلوبة:

منضدة السحب

كلّابة حدادة

فرن اللحام

Size and round

Pass the pipe through sizing rolls, which reduce it slightly, lengthen it and loosen the heavy welding scale. Then roll it to its finished size and circular shape, which removes the scale and leaves the walls smooth.

الأدوات المطلوبة:

مدحلة الدرفلة

Cool, straighten and clean

Let the pipe cool slowly as it crosses a table, then straighten and smooth it in cross rolls. Wash off the loosened scale in a tank; blow it out of the smaller sizes with compressed air.

الأدوات المطلوبة:

مدحلة الدرفلة

ماء

ضاغط هواء

Cut, thread and test

Cut off a short length at each end, where the tong jaws crushed it. Thread the pipe, then test it inside with water at 700 to 800 lb per square inch to prove the wall and the weld. Ours: hacksaw, die set and hand test pump; the booklet does not say how the ends are cut or threaded.

الأدوات المطلوبة: