[...]... didn't even bother the nonstick coating on the other side! heli-arc welding, though this is a trade name established by the Linde Corporation many years ago The name refers to the fact that back then, helium was used as the shielding gas for the process, though today argon is the most commonly used gas for TIG welding Either shielding gas has the capacity to exclude foreign materials during the welding process,... unusual The advertised duty-cycle of a welding machine is usually given at the maximum current draw of the machine, the highest amp setting This setting of course 2-17 Haynes Welding Manual is required only when welding the thickest material the machine is capable of As the amperage setting of a welding machine is reduced, the effective duty-cycle is increased, so that there is somewhere on the welding. .. and consumed at the weld When you pull the trigger of the MIG gun, you start the supply of amperage (when the arc starts on your work), the feeding of the wire electrode, and the flow of shielding gas, which is also routed inside the gun's cable and comes out of the tip all around the electrode, preserving the integrity of the weld like the flux coating does on arc rods The advantages of the MIG system... years on the road you are welding, the only other variable to control is the speed the wire is fed into the weld puddle If the speed is wrong, there will be a lot of sputtering and uneven welding and penetration Most MIG weldors tune the wire-speed in by sound, They set up on a scrap piece of metal with a wire speed that may be too slow or too fast, then pull a bead while adjusting the speed When the right... better When welding with oxy-acetylene equipment, the basic procedure is to set the proper gas flow to the torch with the regulators, crack open the valves on the torch, light the flame with a friction-sparking lighter and then adjust the ratio of oxygen to acetylene to achieve the proper flame Changing tip sizes makes a bigger or smaller flame, so you suit the tip size to the thickness of the parent... molten and the two edges fuse together Most often, the complete joining of the two metal edges is accomplished by melting new metal into the joint at the same time The new metal added to form a fused welding joint is called filler metal, while the original pieces being joined are called the parent metal Together they form a welded "bead" of filler and parent metal that is usually thicker than the parent... Types of welding 2.24 While TIG or heli-arc welding is considered by many to be the most controllable welding technique, it takes more practice than any other You have to learn to manipulate the torch with one hand, the rod with the other, and the amperage control with your foot on a pedal There are no sparks, spatter or slag Here an aluminum frypan's handle mount is being repaired The heli-arc welding. .. metals, and the closer the caratnumber is to 24, the more gold is in the object The other alloys reduce the expense of the pure gold and make it more durable and useful Were rings and other jewelry to be made of 24-carat pure gold, they would be too soft and not last in normal use Most of the metals you will be working with in your welding will be of two kinds, ferrous and non-ferrous The former includes... basically from stick welding and MIG welding in that tackle a project like this until you have mastered the process the electrode is not consumed, and filler rod is separately hand-fed into the weld puddle when needed In operation, the machine is turned on, the weldor brings the torch close to the work and depresses the foot pedal to start the arc Current flows through the tungsten to the workpiece, creating... melts the parent metal, with the operator controlling the amperage with the footpedal while welding, and feeding the appropriate filler rod to the puddle as needed The tungsten electrode has a very high melting point and is not consumed What makes the heli-arc different in practice from other systems is the higher operator skill required, since the weldor has to coordinate with both hands and the foot . alt="" The Haynes Welding Manual by Jay Storer and John H Haynes Member of the Guild of Motoring Writers The Haynes Manual for selecting and using welding equipment ABCDE FGHU KLMNO PQRS Haynes. of welding consisted of heating the objects to a certain color (fairly precise indicator of the tempera- ture) and quickly hammering them together on the anvil. The heat and pressure joined the. 24, the more gold is in the object. The other alloys reduce the ex- pense of the pure gold and make it more durable and useful. Were rings and other jewelry to be made of 24-carat pure gold, they