back and forth be- perforated with a number of countersunk holes to through the blast furnace plant, where the iron ore is} tween the upper and lower rolls, the upper roll being enable them to bite the skelp and insure its being smelted and east in the shape of pig iron, and through | gradually… … 3.—LAP-WELDING A 16-INCH PIPE. ends are cut off. These ends are taken to the testing department, where they are put through various by decarburization with the air blast and rolled into|forming up the pipe is adopted only for sizes from 8 flanging, crushing and bending tests, as will be ex- long…
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