Mfg. tubular welding wire filled with powder - by bending metal strip to make slotted tube, which is filled with powder and then drawn into wire (SE 24.5.82)

摘要

Cold rolled metal strip is formed into a tube with a longitudinal slot, which is filled to 5-65 vol.% with powder. The slot is closed to make a tube, which is then drawn with a total redn. of 70-95%, the redn. in a single pass being 20-45%. The thickness(h) and width(B) of the metal strip is obtd. from formula (I) and (II) where K is a factor depending on the total redn. and is 0.9-2.25; d is the final dia. of the drawn wire; GB is the specific gravity of the strip; GPz is the specific gravity of the powder; KF is the coefft. of powder filling, viz. 0.05-0.65; and D is the dia. of the tube prior to drawing, and complies with the formula D= 2Kd. High drawing speeds per drawing pass, and a high total redn. can be obtd.