How do I solve this problem volt x Amperage x 60 divided Travel Speed (in./min) = J/in.

This is a descriptive formula used for material to weld (alloyed) metals.

This formula, when fully exhibited, defines the minimum and maximum energy to optimize the use of flux-cored and other types of welding wire. The result of the solution is heat input measured in joules per inch. More technical detail for its use may be found on welding sites.

 

Heat input (in Joules per inch) = volt x amperage x 60 divided travel speed (in./min). A break down for the this follows:

 

Volts * Amps = Power. When power is multiplied by time it yields energy. The time in this case is 60 seconds. This gives energy per minute. The result in this case yields joules per minute. When this is divided by the travel speed in inches per minute the result is joules per inch.

 

One actual example for a type of flux-cored wire reads : Special heat input restrictions: 12,500 joules/inch minimum and 63,000 joules/inch maximum. Calculated with formula Heat Input = Amperage x Voltage x 60 divided by Travel Speed. Amperage in (amps), Voltage in (volts) and Travel Speed in (inches/min.).

 

Depending on the material to be welded, the welder may want to use 200 amps @ 26 volts and a travel speed of 10 inches per minute. The calculation would be:

Heat Input = 200 x 26 x 60 / 10 = 31,200 Joules/inch

This is well within the flux-cored wire specification.

 

This is just one of many physics-based aspects of welding.

 

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