A DISCUSSION ABOUT PREVENTION FROM BULGING IN BLANK FORMATION PROCESS OF WELDED STEEL TUBE

The writer briefly analyses the mechanism of edge-bulging of the strip being formed into blanks to be welded and makes the point that in most cases the said bulging is developed due to a combined effect by such factors as material, groove, passing line, equjpment and operation.Some countermeasures against bulging are also proposed here.