Stud welding
AssigneeEmhart Inc.
InventorsCarl W. Lesser, Earl J. Schnur
Life of this patent
Estimating the term…
Abstract
Method and apparatus for automatically compensating for spring fatigue and aging, mechanical wear, and the like in a stud welding machine. In order to hold plunge time at an ideal constant value, the plunge times of each weld are measured and a running average is generated to adjust the command to drop the stud onto the workpiece as necessary to hold plunge time substantially at the ideal constant value.
Claims2
In a stud welding machine having lift means for moving a stud toward and away from a workpiece to which it is to be welded and means to create a main arc between said stud and said workpiece to melt the portions of said stud and said workpiece to be welded together, the improvement comprising a method of compensating for changes in drop time to hold plunge time substantially at an ideal constant value, comprising the steps of measuring the actual plunge time of each weld, continuously averaging a predetermined number of said actual plunge times on a rolling basis, and changing the time of the drop command to said lift means to the next cycle.
Dependencies are inferred from the claim text.