Oxford welders top offers: When appearance counts, TIG welding creates a high quality, clean weld that is far less likely to distort the metal by using a nonconsumable tungsten electrode. There is no need to worry about splatter because it only uses the necessary amount of filler metal needed in the welding puddle, making for the highest quality weld in every respect. However, TIG is fairly specialized and requires a good deal of training in order to master it—so make sure any TIG welder purchase is paired with a plan to take welding classes. Instead of the point and shoot simplicity of MIG welding, TIG requires the use of a foot pedal to regulate the welding process. A filler rod that is separate from the torch that must be fed in gradually. Many professional welders prefer TIG because it can weld a wide variety of metals and because of the versatility of argon gas used during TIG welding. There is no slag to block the view of the weld puddle. Argon gas can weld any metal at any thickness with TIG welding, and therefore there is no need to change the gas depending on the project.
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Should the electrode accidentally touch the metal or the filler, the electrode often becomes contaminated – meaning some of the rod or base metal gets stuck to it. Once the electrode is contaminated, the arc cone becomes misshapen, making it difficult or impossible to aim the arc with precision, and the boiling contaminants on the electrode may spit out impurities, further compounding your problems. The angle between the torch and the base metal is important, too. You need to angle the torch slightly to see the puddle, and provide access for the filler rod. A 15-degree angle is a good starting place, although some welders prefer a bit more or less. If you hold the torch at 45 degrees (or more), you’re losing a lot of the coverage from shielding gas, and the flatter angle will make the puddle longer than it is wide. For the record, the torch is tipped with the electrode pointing forward, in the direction of motion.
One of the “cardinal sins” that almost every shop commits is over-welding. This means that if the drawing calls for a 1/4″ fillet weld, most shops will put down a 5/16″ weld. The reasons? Either they don’t have a fillet gauge and are not exactly sure of the size of the weld they are producing or they put in some extra to “cover” themselves and make sure there is enough weld metal in place. But, over-welding leads to tremendous consumable waste. Let’s look again at our example. For a 1/4″ fillet weld, the typical operator will use .129 lbs. per foot of weld metal. The 5/16″ weld requires .201 lbs. per foot of weld metal – a 56 percent increase in weld volume compared to what is really needed. Plus, you must take into account the additional labor necessary to put down a larger weld. Not only is the company paying for extra, wasted consumable material, a weld with more weld metal is more likely to have warpage and distortion because of the added heat input. It is recommended that every operator be given a fillet gauge to accurately produce the weld specified – and nothing more. In addition, changes in wire diameter may be used to eliminate over-welding. Read a few more details at www.weldingsuppliesdirect.co.uk.