Heat transfer during welding
Heat transfer during welding
(OP)
I have been asked to weld a track-way for a water cutting machine onto the outside of an un-cleaned storage tank. My client has asked for me to prove with calculations that the amount of heat we will b inputting on the outside of the tank shell will not be sufficient enough to make the product on the inside ignite or go bang.
The heat input at the end of the welding rod can be taken as 1500 degrees C and the tank shell is 15mm thick carbon steel. It is our intention to hold the track way on with 5-6mm tack welds spaced 0.5 metres apart.
Can anyone help me with how to go about this?
The heat input at the end of the welding rod can be taken as 1500 degrees C and the tank shell is 15mm thick carbon steel. It is our intention to hold the track way on with 5-6mm tack welds spaced 0.5 metres apart.
Can anyone help me with how to go about this?





RE: Heat transfer during welding
RE: Heat transfer during welding
RE: Heat transfer during welding
The manager
RE: Heat transfer during welding
RE: Heat transfer during welding
I have found a formula for heat input it is as follows, the figures after the variable identities are the parameters we are using.
H=60EI/1000S
H=heat input (kJ/in or kJ/mm)
E=arc voltage (20 volts)
I=current (80 amps)
S=travel speed (in/min or mm/min) (300mm)
I can not bolt the track-way on as this would mean drilling holes in the tank & at the moment there is no access to the inside as it still has about a metre of residual product in it.
I will research the magnetic track-ways but would still like to know how to calculate my original question. Experience tells me that I could hold my hand against the inside of this plate without getting burnt but the client wants to see figures.
RE: Heat transfer during welding
Get a chunk of the same thickness material and a length of track and weld. Then measure the temperature on the back side.
RE: Heat transfer during welding
RE: Heat transfer during welding
I'd be more worried about the track staying in place.
A heavy (1/4 to 3/8) fillet weld on the outside of a 1/4 inch wall steel wall will burn the paint applied inside. Tacks for the same material on the same thickness will discolor, but not burn, an (epoxy) paint layer inside.
RE: Heat transfer during welding
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor