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Thread: Stick welding and stubs
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29th May 2020, 03:24 PM #1China
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Stick welding and stubs
The other day I was looking on as an acquaintance was doing some stick welding, every time he finished a run he changed the electrode weather it be only half used or or not.
this person has been employed as a welder for at least 20 years that I know of, is there some reason to do this or is it just a strange quirk he has.
When I weld at home I use the electrode until is virtually gone.
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29th May 2020, 05:13 PM #2Most Valued Member
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Would they of been able to get the desired run length from the partially used rod ?
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29th May 2020, 07:42 PM #3
Main factor is - who is the guy buying the rods?
Although some rods do re-strike better than others. Some 7016's can be quite cantankerous with a hard glassy flux cap over the tip. I'll usually scratch it on a file to remove it without too much flux damage.
Or for a plot twist- Maybe in 20 years he hasn't mastered the ability to restart a weld and tie it in.
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30th May 2020, 01:10 PM #4
I agree with Commander Keen above but I think there is something else to add.
On the shop floor as a young tradesman, I saw welders who wasted like electrodes that. I think that they were not positioning their arms/hands adequately to accommodate the changing length of the electrode.
Taking a straight fillet bead as an example ,a good welder should be able to keep the offset and drag angle from start to finish during the progression of the weld.
I surmise they were not locking their wrist which buggers up the angles as they swivel through the limited arc of wrist movement.
As the electrode becomes shorter it become more difficult for them to maintain the angle and as a result they stop prematurely and change electrodes.
As an young apprentice in the late sixties the instruction from the foreman was to drop the stubs in a can and he counted them. Woe betide me if any were too long.
The practice is wasteful in terms of electrode cost and time lost through unneeded electrode change, chipping flux and electrode restart. On a big job the waste is considerable.
Grahame
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30th May 2020, 01:34 PM #5Diamond Member
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If you work to welding procedures you cannot restart a rod once you have stopped*, he is probably just in the habit of getting a new rod each start.
*cant for the life of me remember why, but think it has to do with the coating of the tip of a new rod reducing impurity's.
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30th May 2020, 02:21 PM #6
The black oxide is applied typically to the end of Low Hyd. electrodes. It is to there start what are sometimes, difficult to cold start LH electrodes.
The problem there is that the new LH rod leaves a bunch of porosity holes at the start of the bead. The correct way to start the rod is move downstream by a couple of stick diameters and strike the arc then snap back to the last bead crater area and match the ripple pattern. Correctly performed it is not easy for the untrained eye to pick the match up point.
With a little practice it quite achievable. The (then downstream) porosities are then overcome by action of the now up to running temperature arc and particularly the excellent fluxing of that electrode type.
The fluxing works so well one can often hear the arc "pop" and feel the spit out of an impurity out of the arc pool accompanied by some red hot slag and spatter.
Heavy use of the LH electrode is a darn good reason to invest in a leather coat or at least some leather sleeves and apron.
If using a low hydrogen electrode at home a striking plate helps. You can position it close to the restart, get the electrode arced and quickly while the electrode is still red hot nip over to the restart area and it will start for you,usually.
Grahame
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2nd Jun 2020, 02:50 AM #7China
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Thanks for the replies, seems as though there may have been some justification depending on his experience
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2nd Jun 2020, 06:19 AM #8
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2nd Jun 2020, 07:56 AM #9
The old inappropriate preposition strikes again.
With a file.
Or I could just use a wood file.
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