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Tools/mig/induction: Difference between revisions

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Tools/mig/induction (edit)

Revision as of 12:27, 10 December 2019

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→‎MMA (Stick welding) Induction: more info on bad welds
imported>Stever
imported>Stever
(→‎MMA (Stick welding) Induction: more info on bad welds)
Line 320:
** Make sure the electrode size is suitable for the work
** Rods must be kept dry, all rods are moisture sensitive but some more so than others
*** Damp rods will form shitty welds and tend to result in slag entrapment and worm holes
** Baking rods if they're not brand new
** Keeping them in a rod oven if you get serious about MMA welding.
Line 348 ⟶ 349:
** Navigating the menus and selecting MMA mode
** Setting suitable current for the electrode size
*** Check online for calculators for current, but absent other guidance, 75-90A for a 2.4mm electrode, 115-140A for a 3.2mm.
** Changing over the leads and connecting the stinger
* Proper position of self and electrode, direction of motion
Line 364 ⟶ 366:
* Moving the pool along
* Keeping the electrode at the nose of the pool
* Dragging the puddle along behind the rod
** Further towards the tip of the pool = fast move, thinner bead, less penetration
* Using the arc force to keep the slag out of the weld
** Further towards the back of the pool = slower movement, wide bead, deep penetration
** This is your primary method of regulating the travel speed, change you aim point and the rate the bead moves across the work will change
* Moving patterns, circles, arc, steady
* You may need to adjust the shade of your mask to get a clear view
Line 377 ⟶ 378:
| Problems ||
[Deliberately set up and demonstrate each of these faults]
* Arc too Long - Large arc visible and moving, puddle wide and flat, lots of spatter, undercut risk
<need to work on this>
* Angle wrong - Poor visibility, lots of slag trapped in the weld "Worm holes"
|| Recognizing faults and knowing how to fix them▼
* Too Hot - Weld sounds very different, hissing not "frying bacon"; puddle overly large, concave and spattery; Deep v-pattern; Surrounding material cooked & distorted; Burn-back and undercut issues
* Too Cold - Globs of metal or a very small bead, weld mounded up convex; not a continuous weld; Weak arc, hard to keep it lit; worm-holes
* Too Fast - Poor penetration; very narrow; might be discontinuous
* Too Slow - Overly penetrated; bead rather wide; surrounding metal cooked; worm-holes; might blow right through the work
▲|| RecognizingRecognising faults and knowing how to fix them
|-
| PracticingPractising a steady bead || Inductee practices laying down a straight and steady, well-fused bead on flat stock till competent || Getting the basics right
|-
| Butt joints ||
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