Tools/mig/induction

Some of the tools at the Hackspace are potentially hazardous to use, for these tools members are required to have an induction before they can use them. Inductions provide the most basic information on how to safely and effectively use the simpler functions of the tools, we appreciate that some members may have professional experience on some of these tools and in this case please tell your induction provider and the induction may be very reduced and just cover any risks or procedures specific to rLab. Some tools have multiple levels of induction in order to cover more advanced uses of that tool without making the basic induction take too long, higher induction levels will introduce some of the more advanced features of the tools but as with all inductions are only intended to provide basic information on the capabilities of the tools and how to use them safely. Some members of rLab may be willing to offer more detailed tuition beyond basic induction level or offer guided practice sessions in exchange for beer money or assistance on their own projects.

For all tools you are only required to take level-1 induction before use, after that you may perform any task that you feel confident you can do safely, higher levels of induction may be useful to you in performing more advanced operations but are not required before doing tasks covered in them so long as you're confident of your ability to handle those tasks without risk to yourself, others, or the tool.

PLEASE NOTE : All induction providers are volunteers who are providing inductions to the best of their ability but are NOT qualified instructors. Inductions are provided on a best-effort basis but you and you alone are responsible for your safety while using the tools and for satisfying yourself that you can operate the tools safely. There are professional training courses available from various providers in Reading and the surrounding area if you feel they are appropriate for the level of work you intend to undertake. Reading these notes is NOT a substitute for an in-person induction.

Note for wiki editors : Please do not edit induction pages unless you are one of of the people that gives that induction

MIG Welder induction - Level 1

Level 1 induction in intended to cover the basics of how to use the MIG welder. It should cover basic safety information and how to use the welder effectively on mild steel in positions 1G and 2G/F. People undertaking MIG induction need to have overalls or other non-flammable clothing that covers all exposed skin except for head and hands, clothes are likely to get burn spots on them. Wear stout shoes or boots, no open shoes allowed. If you have any metal you'd like to practice on then please bring it with you so long as it's plain steel with no galvanised coating or paint but if you don't have any then we usually have suitable scrap around to practice on. There's no charge specifically for the induction but normal welder usage charges apply, you should expect it to cost around £5 for the induction and a bit more if you spend some time practising afterwards which is strongly recommended

Topic	Detailed contents	Rationale
Types of welding available	MMA - Fast, thick, dirty, good outdoors, medium-high skilled MIG - Fast, medium thickness, relatively clean, low-skill requirement TIG - Slow, Neat, special materials, super-clean, high-skilled Forge - V.V.Slow, good for big flat welds, high-skilled Spot - Tiny spot welds for joining plate, low-skilled	Which technique to use for which weld
How it works	Machine strikes an arc between the work and a consumable wire electrode, melting a pool of metal Wire dips in and out, adding metal to the pool Gas shields the hot metal from the air Earth clamp provides return path	Basic process details
Safety	Fire hazard Metal sparks and radiant heat/light Clear area of flammable materials, be aware of solvents and vapours Having fire extinguishers handy and what types are suitable Arc-eye hazard to you and people around you Using an auto-darkening welding mask Suitable settings on mask (9-11, 12 maybe - start at 10 and adjust) Shouting "Eyes" PPE - Overalls, stout shoes, thick leather gloves, mask, dust protection when needed, Cover all exposed skin or you'll regret it! Care with Galvanised steel, risk of metal-fume-fever Gas safety Enclosed spaces Low spaces Fumes Electrical Safety The voltage is low, but you still don't want to touch it Mind what you point the torch at Power cuts off as soon as the trigger is released NO RINGS, NO WATCHES!! If something does go wrong, shut off power before anything else	Using the equipment without harming self or others
Preparing to weld	Check metals are suitable Mild steel only Beware of galvanised steel Beware of lead-bearing and copper-bearing paints General angle grinder safety Types of disc Inspecting grinder and disc Changing the disc Care of position and cut angle Dust protection, eye protection, gloves DO NOT TWIST in a cut Clean up weld area - be aware of burning paint Clean area for earth clamp Bevelling edges to form a path for the bead on butt joints No bevel on thin materials Regular 2/3rds bevel most of the time Bevelling from both sides for very thick	Proper preparation is necessary for good welds, cover bevel patterns for other weld types later
Machine Description	Parts Base unit Power source Wire feed mechanism Torch Shroud Tip Trigger Gas bottle Types of gas and why Regulator Basic gas bottle safety Earth Clamp Controls Gas Flow Wire Feed Power Don't worry about timer mode, it's not very useful and just make sure it's turned off Wire type, liner and torch can be changed, but not covered at induction level-1	Covering what all the parts are called and which control does what
How to actually execute a weld	Normal welder settings Gas at 8L/min will work for all normal welding modes Timer off unless you know you need it Reasonable starting settings for 0.6mm Mild Steel wire Metal Thickness Power Setting Wire feed rate Note <1mm 1 2 Very difficult, try TIG instead 1mm 2 3 2-3mm 4 4-5 5mm 6 8 >5mm 6 9 Not recommended! Probably won't work Proper position of self and torch, direction of motion Push welding - Normal, safe option Pull welding - bigger bead, better penetration, lots of grind and risk of inclusion Vertical and overhead welds Correct distance Proper posture for welding Getting comfortable Supporting the cable if needed Chairs if they help How the pool forms Dip transfer, globular transfer, spray transfer Taking the pool "for a walk" Moving patterns, circles, arc, steady Proper sound "Frying Bacon" [Demonstrate a good simple weld bead]	Cover the basic technique of establishing and moving a weld bead
Problems	[Deliberately set up and demonstrate each of these faults] Erratic weld, globular transfer - too little wire feed Stabbing and poor penetration - too much wire feed Bead sitting on surface - too fast or too little power Weld flat and spattered - too much power over-penetration - too slow or too much power blowing holes in material - MUCH too much power Lots of sparks and brown/porous weld - not enough gas or too far away Weld moves around erratically - too much gas or influence from holding magnets Weld sticks to tip - too close	Recognizing faults and knowing how to fix them
Practicing 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	Proper grinding and prep Bevels right way up and properly spaced Proper fit-up between parts Option of using backing blocks (temporary and permanent) Using holding magnets and clamps Do NOT tack work to the table Tacking to limit distortion, you are GOING to get distortion Straight, back-tack and half-split tack welding Root-weld and multi-pass welding on thick material [Demonstration and practice till successful]	Executing the most basic weld
Fillet joints	Don't need to grind, but parts need to be clean Good fit-up essential Proper torch position and angles Push angle a little steeper than normal Biased towards the vertical plate Weaving pattern, spending more time on upper plate Stitch and alternating stitch to control distortion Pre-compensation for distortion [Demonstration and practice till successful]	Second most common weld type
Lap joint	Lack of need for grinding but must still be cleaned Treat is as two fillet joints But watch out for heat buildup in the edges Extra care if the sheet is thin to watch for balling up Alternating stitch welds to control distortion	Next joint type
Pool Welds	Good for joining things that are meant to be bolted in Cleaning up the surfaces Starting from the centre on a small one to ensure fusion to base plate Starting from edge on large pools and may not need to fill it in compeltely Care with thick base plates as heat dissipation may cause cold-shuts	Fixing wheels and fittings onto things
Shutting down and cleaning up	MIG welds usually require grinding back with an angle grinder to make them neat Wire brush if you don't care about cosmetics Flap discs will tidy up welds that are good to start with Grinding discs will remove messy welds quickly Shutting off and purging the gas before un-hooking the couplings When you're done shut off the power to the welder Sweeping up and putting everything back where it belongs Working out your total weld length and paying for it Discuss any projects the inductee is working on to provide pointers	Clean up after yourself and pay what you owe!
Final thoughts	This has only been an extremely brief over-view of MIG welding Do not expect your joints to be structurally sound or pretty until you have practiced If you want to weld aluminium or magnesium alloys, Stainless Steel, Brazing or other techniques then you can look at TIG level 2 or MIG level-2 inductions although it's not compulsory to do level-2 inductions if you've already done the relevant level-1 inductions and if you think you can manage these techniques without further help If you want further tuition then some members of rLab are willing to provide this, but they may charge for it.	Closing comments

MIG Welder induction - Level 2

Level 2 induction should cover more advanced uses

• Welding mild steel in position 3
• Changing wire, torches and liners, proper setting of wire feed and tension
• Welding with Aluminium and Stainless Steel