stupid questions

[mitch93]

Im sorry i have to ask a stupid question but i have googled this term a but load and cant find the definition so i have to ask you guys, what exactly is a "HOT PASS?" and so i dont have to make another thread what are your guys' procedures for running welds that require a root, cap and fill in a beveled edge, more specifically, do you mess with amps and or volts throughout, ect. And for my last dumb question, do different stick electrodes require different travel speeds? For example, if I was making a complete plate with a but weld (6010), lap and tee weld with 7018, and an edge weld with 6013 all 3/32 rod, mild steel 8th inch.

[Cofe]

Originally Posted by mitch93

Im sorry i have to ask a stupid question but i have googled this term a but load and cant find the definition so i have to ask you guys, what exactly is a "HOT PASS?" and so i dont have to make another thread what are your guys' procedures for running welds that require a root, cap and fill in a beveled edge, more specifically, do you mess with amps and or volts throughout, ect. And for my last dumb question, do different stick electrodes require different travel speeds? For example, if I was making a complete plate with a but weld (6010), lap and tee weld with 7018, and an edge weld with 6013 all 3/32 rod, mild steel 8th inch.

Hi Mitch, I will try to answer you're questions in order.

A hot pass is the next pass after a root pass.

There are many procedures for running welds depending on thickness, material type, use of the material, and compatibility of metals.

Amps are adjusted frequently, voltage changes are less frequent.

Stick electrodes require different travel speeds according to size, type, and position.

Practice is of vital importance. Choosing the correct procedure will save time and money.

[aevald]

Hello mitch, to add just a bit to what Cofe has posted and to specifically address the "hot pass" I might add a few additional items. After applying the root pass on an open-root type of weld the next pass is generally referred to as a "hot pass". It can be used to address a number of different types of conditions that are the result of the "root pass". When there is excessive build-up on the root side of the joint a properly adjusted and applied hot pass can actually "suck-back" the excessive build-up and prevent the need for a grind-out to make the necessary repair. Sometimes when the root pass has been applied there will be areas of excessive undercut and trapped slag along the toes of the root pass, using a hot pass can help to burn-out and fill these deficiencies. In still other instances, the highs/lows created by starts/stops of the root pass can be evened out and filled to allow for a more uniform base to apply the additional fill passes and set-up the cover pass better. Operator skill and experience will often dictate how a particular welder will utilize the hot pass and apply it to help him/her to do a better job and avoid a lot of unnecessary rework. Just a bit more to consider.

[mitch93]

thanks guys. so with the hot pass are your amps supposed to be higher vs the remaining stringer beads? will it be a wider bead than the rest of the filler beads?

[Cofe]

Originally Posted by mitch93

thanks guys. so with the hot pass are your amps supposed to be higher vs the remaining stringer beads? will it be a wider bead than the rest of the filler beads?

Hey Mitch, Yes, say you run a root with 6010+ and are ready to run a hot pass. You're root was preferably run at 92 amps. Now for the hot pass.
Crank it up to 105-110 amps and burn the baby in. ( you may have to step the bead)"whipping the rod forward and back into the puddle" to keep from burning through.
Yes it should be a wider bead, and will cover the tie inns of the root bead.
Then you are ready for intermediate passes.
And finally the cap.

Root
Hot pass
Intermediate passes
Cap