Tools/mig/induction

MIG Training

Welding Generally MMA - Fast, thick, dirty, good outdoors 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 Spot - Tiny spot welds

Machine description Parts Base unit Wire feed mechanism Torch Shroud Tip Gas bottle Types of gas and why Earth Clamp Controls Gas Flow Wire Feed Current Wire type, liner and torch can be changed, but not covered at induction How it works Machine strikes arc wire dips in and out gas shields the hot metal earth clamp provides return path

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 Arc-eye hazard to people around you, shouting "Eyes" Suitable settings on mask (9-11, 12 maybe - start at 10 and adjust) PPE - Overalls, stout shoes, gloves, mask, dust protection when needed Cover all exposed skin or you'll regret it! Galv warning Gas safety Enclosed spaces Low spaces Fumes

Prep General angle grinder safety Care of position and cut angle dust protection, eye protection, gloves DO NOT TWIST in a cut Changing the disc Types of disc Check metals are suitable Clean up weld area - be aware of burning paint Clean area for earth clamp Bevelling edges to form a path for the bead No bevel on thin materials Regular 2/3rds bevel most of the time Bevelling from both sides for very thick

Practice 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 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" Problems you might find 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 Getting a nice steady bead on flat material

Butt joint Proper grinding and prep Bevels right way up and properly spaced Option of using backing blocks using holding magnets and clamps Do NOT tack work to the table Tacking - you are GOING to get distortion Root-weld and multi-pass welding on thick material straight, back-tack and half-split tack welding

Lap joint Proper grinding and prep

T-joint Proper grinding and prep

Pool welds