Travel speed for Calculate of heat input

By TimGary (****)

Date 06-22-2015 12:50

Neither are correct...

Heat Input (Joules per minute) = (Volts x Amps x 60) / Travel Speed (IPM)

By Toey TNDT (**)

Date 06-22-2015 13:26 Edited 06-22-2015 13:30

V x A x 60 / Travel speed

when i recorded . time shows minute or second but i'm not sure about 68 s
How i can translate 68 s to formula of Heat in put.

28 x 150 x 60 / 170

or

28 x 150 x 60 / 132

By electrode (***)

Date 06-22-2015 16:12

Toey TNDT,

Tim Gary is correct; i.e. "neither are correct".

I'm not really sure whether I do understand you correctly.

Anyway.

If you apply (U) 28 V at (I) 150 A (= 4.2 kW), length (l) = 150 mm and time (t) to travel this length = 68 s.

That should give you ~ 2.2 mm/s or 132 mm/min travel speed.

Hence. (4200/132)x60 ~ 1909 Ws/mm ~ 1.909 kJ/mm

At least if I'm right in understanding you and without all further tricky details (process efficiency,...) involved.

By 357max

Date 06-27-2015 18:08

D1.5M/D1.5 2010
5.12 Heat Input Qualifications

"Heat input shall be determined using the formula:

Heat Input (kJ/mm) = Amperage X Voltage X 0.06 / Travel Speed (mm/minute) or

Heat Input (kJ/in) = Amperage X Voltage X 0.06 / Travel Speed (in/minute)"

By 803056

Date 06-22-2015 23:59 Edited 06-23-2015 14:20

Toey, you are having difficulty calculating travel speed. The following equation shows how I calculate heat input.

L is the total length of the test assembly.
S is the number of seconds to weld the entire length (per pass). Don't forget to stop the stop watch if the weld is interrupted to change electrodes, rods, or any other reason.

Here in the US we are using inches per minute for travel speed, but it can just as well be mm/minute if you like. Notice that "60" constant cancels out in the numerator as well as the denominator. The 60 in the numerator is to give you an answer in Joules/inch, while the 60 in the denominator is to convert travel speed from inches /second to inches per minute. Either way, the terms cancel.

The heat input is calculated in terms of Joules per inch.

I hope I did it correctly. I see I misspelled Joules in the formula.

Best regards - Al

By Toey TNDT (**)

Date 06-23-2015 03:31

Thank you AI for Best answer

By electrode (***)

Date 06-23-2015 09:07

Of course I need to respectfully disagree. How, my question, can 'heat input' be ever defined as (quote) 'calculated in terms of Joules per minute' (unquote)?

Apparently there's some fundamental reconsiderations required here to match this statement with the expression provided. Misspelling 'joules' should be negligible vs. the statement above.

Despite the warm answer already received by the OP, sure you'll agree that my comment makes sense.

By 803056

Date 06-23-2015 14:21

Good catch, Joules per inch, not Joules per minute.

Al

By electrode (***)

Date 06-23-2015 17:03

Good to see we're all human.
Well explained though.

By 803056

Date 06-23-2015 19:15

Thanks for the compliment.

Human? My wife might not agree.

Best regards - Al

By electrode (***)

Date 06-23-2015 20:34

LOL!
I seem to understand.
Isn't there a universal rule exisiting?
"You shall not go against your wifes word".

By welderbrent (*****)

Date 06-24-2015 00:18

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Don't mind me, I've been up too long again.

I know Henry. I'll get some sleep on my way home tonight.

Brent

By 46.00

Date 06-26-2015 12:15

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