Tig Welding

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PROCEDURES

* Bring out the MIG welder for a MIG welding. * Make sure the MIG welder is functional and in a good condition.| | * Installing the wire and look after the wire feed and spool * Check that the feed rollers are clean,oil-free and match the wire diameter in use * Wire feed is the most common cause of MIG welding problems so check it properly.| | * Set roller pressure and wire spool drag so that with the torch trigger down and the feed rollers turning,you can just brake the moving wire to a stop with your fingers| |

* Open the main valve of the cylinder and make sure that the there is some gas in it. * Your gauge should be reading between 0 and 2500 PSI in the tank and the regulator should be set between 15 and 25 PSI depending on how you like to set things up and the type of welding torch you are using. * Without the gas your welds will look brown and splattered. | | * Adjust welding voltage by increasing voltage makes the arc progressively longer and wider so it heats a bigger area. * Aim for a voltage which will give good penetration and fusion in the particular joint.| | * Adjust wire speed by welding current rises with wire feed speed until the wire can carry no more,at which point extra speed just puts more filler into the joint. * The aim is to bring feed speed into balance with voltage,so filler wire is burnt off tidily and welding current matches the work.| |

* Check the MIG gun is functional and in a good condition. * Now we can start our project.| | * Make sure that your welder is properly attached to a power source and to a shielding gas source. * Push the welder’s control trip or trigger.This should start wire feed and cause the shielding gas to flow.| | * Keep the contact tip steady,and slowly guide it along the material you’re welding. * Try to maintain the same distance between the contact tip and the welding material| |

* Hold the mig welder at 90-degree angle when welding a flat surface and at 45-degree angle when welding two piece of metal that meet at an angle. * If using a weaving technique, momentarily hold the arc on the groove sidewall| | * Reduce your travel speed so the weld metal completely fills the melted-out areas of the base metal. When using a weaving technique, pause slightly at each side of the weld bead.| | * Finish welding,and shut off the welder and power supply| |

SAFETY EQUIPMENT

* Wear a welding helmet for a protection from the light generated by any form of arc welding that will burn your eyes and skin just like the sun.| | * Wear gloves and leathers to protect yourself from molten metal splattering off your work piece.| | * Wear safety shoes steel reinforcement is specially designed shoes to protect your feet from hazards such as rolling objects, falls, cuts or sharp.| |

INTRODUCTION

Tungsten inert gas (TIG) welding is the process of blending together reactive metals such as magnesium and aluminum. The TIG welding method became popular and useful in the early 1940s and, as a result, has greatly propelled the use of aluminum for welding and structural processes. TIG welding is commonly used for both high quality and manual welding. During the process of TIG welding, an arc is formed between a pointed tungsten electrode and the area to be welded. As a result of the gas shield, a clean weld is formed. This prevents oxidization from occurring. The type of gas shielding typically used for TIG welding is argon, helium, or a combination of both. When combined, these two gases can ensure a higher welding speed and welding penetration. Argon is the preference of most welders when it comes to TIG welding. It is often used simply because it is heavier than air and provides better coverage when welding. With TIG welding, one can perform a variety of weld types on several different metals. Steel and aluminum, however, are the two most widely used metals....
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