OK, so it is another little formula I have to do before I plug it into the main formula. Or said another way, I take my inches welded and divide by the time, take that answer and divide it into the numerator sum and I'll come up with the Kj/ per inch.
24" welded took 1:33 is 24/ 1.55= 15.4 in per minute.. then take that and divide into 330A X 30V X.06= 594
Heat input (Kilojoules/in.)= Amps X Volts x 0.06 divided by Travel Speed (in/minute). Some formula / by 1000, .06x1000 =60 or 60 minutes. To move the decimal. .006 or 1000's of 60. it's just a short cut.
converting the seconds to minutes to account for constant units with the Travel Speed (inches/min)
1Joule/1second x 60seconds/1min = 60joules/1min --> now changing the Joules to Kilojoules --> 60Joules/1min x 1kJ/1000Joules = .06kJ/1min which becomes our multiplication factor to account for consistent units in the original equation.
Thus,
Amps x Volts (J/s) x .06 (to convert to kJ/min) / TS (in/min) = HI (kJ/inch) --> the minutes end up in numerator and denominator and cancel each other.
Ahh, conversion factors . . . great for shortcuts, but when you don't know why they are applied they can be pretty confusing.
Voltage times Amperage times 60 / Travel Speed (ipm) = heat input in joules per inch. Divide by 1000 to get kJ/in. Where travel speed equals:
Length welded divided by the time taken to weld the joint, so: (Length welded/ (minutes times 60 plus seconds to weld the length welded)) = travel speed in inches per second. Now multiply by 60 to get travel speed in inches per minute. Therefore the equation can be written as:
(V x A x 60 / (L/(m x 60) + s) x 60) / 1000 = kJ/in.
Where V = voltage A = amperage 60 is a constant
L = length of joint welded m = minutes s = seconds
kJ = kilojoules
Your example: 300A x 30V x 60 / ((24 in/(93 sec)x60) / 1000 = 34.875 kJ/in. (there may be differences due to rounding errors or I could be wrong with my number crunching)
Sorry I didn't folow up, its been real busy getting ready for my audit. Thank you for all your input everyone. The first time I did this, I incorrectly figured the travel speed, and my values were way out of wack. I'm all set now.