In gas welding or brazing where the electrodes don't include a filler metal, welding rods are essential to the metal joining process. For people who work in the business the welding rod is probably the most important piece of equipment since this is where all the action takes place. The welding rod concentrates heat and leads to the manipulation of the metal, which is why the correct choice is determined by a whole series of factors. First of all we should mention the fact that the welding rod is selected according to the type of material that needs to be worked on. The decision is made according to the metal structure: mild or low, steel or aluminum and so on.
Then the presence of melted components in an alloy may also influence the type of welding rod used in the process: chromium, manganese and vanadium are usually the more likely to be present in the metal that is going to be welded. Furthermore, copper, bronze, aluminum and lead require the use of special rods for smooth technological processing. The correct welding rod is the guarantee of a good metal bonding; if you cannot distinguish among the many types of welding rods it is good to ask for professional advice so as to avoid possible low quality weld execution.
Welding rods are marked with special numbers that reflect the tensile strength of their components. It is important to know how to read the special information formulated under the form of numbers, since the success of the metal joining relies on this interpretation. They are general guidelines that point to the metal type, the flux compounds, the arc penetration level, the type of the power supply necessary and the position of the joint where the weld needs to be made.
The diameter of the welding rods used in any technological process needs to be chosen according to the thickness of the metal that needs to be processed. Professionals recommend that the welding rods and the metal have the same size, so that the amperage setting is made correctly. In case you make the mistake of setting an amperage superior to the dimensions of the welding rods, too much heat will be generated. There are two possible outcomes of such situations: either the welder has to be quicker in the execution or the metal will burn out. In case the amperage is lower to the dimensions of the welding rods, the metal penetration won't be satisfactory since the electric arc created is too sluggish to be effective.
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Original source: http://www.articlesbase.com/remodeling-articles/factors-to-consider-when-choosing-welding-rods-309158.html
