Under the arc welding process, heat input and arc energy are the measures of energy that has been supplied to the piece to form a weld. Both are measured in units of energy per unit length.
It refers to a characteristic or dimension such as weld length, a bead, the diameter of a weld spot, or cross-section. The amount of heat input that goes into a weld is determined as a function of time.
Formula for Heat Input
The heat input formula is given by,
KJ/in is the unit.
The accurate measurement of arc voltage is the difficulty here, but we mostly measure load voltage at the output terminals of the current source.
Solved Examples
Example 1
You weld at 400 inches and 39 volts per minute. The weld is 35 inches long, and welding takes 4 minutes. While welding you find that the system shows an amperage of 425. Which is your input heat?
Solution:
Travel speed = 35/4
Travel speed = 8.75 inches per min
Heat input = 113.65 KJ/in
Comments