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Method of automatically controlling height of a weld bead

  • US 4,608,481 A
  • Filed: 03/27/1985
  • Issued: 08/26/1986
  • Est. Priority Date: 05/28/1984
  • Status: Expired due to Term
First Claim
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1. In an arc welding method for effecting welding by reciprocatorily oscillating a welding electrode in a width direction within a groove of a pair of metals to be welded which comprises performing a control operation of varying a distance between a forward end of said electrode and a base metal surface by means for driving said welding electrode in an axial (Y-axis) direction so as to maintain a predetermined welding current or arc voltage and thereby always maintain an arc length constant, moving, simultaneously therewith, said electrode in a width (X-axis) direction of said groove and reversing the direction of said X-axis direction movement when said distance reaches a predetermined value, and thereafter repeating said operations such that the arc at said electrode forward end is caused to accurately follow said groove while being reprocatorily oscillated in the width direction within said groove and a height from said base metal surface or a root of said groove to each extremity of said reciprocating oscillation is always maintained uniform, a method of automatically controlling the height of a weld bead comprising the steps of:

  • detecting an oscillation width Wwo during a period of a preceding cycle of said oscillation and an oscillation width Ww during a period of a current cycle;

    obtaining a welding speed V in accordance with said oscillation widths Wwo and Ww, a desired bead height h, a wire feed speed Vfo and a welding speed initial set value Vo ##EQU3## executing said welding speed V during the next oscillation cycle; and

    repeating thereafter said operations.

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