January 15th, 2012 | 
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Welding is a complex subject, and this report is far from being full, on any aspect of it. However, one thing that it attempts to cover is a few beyond doubt vital requirements and a amount of basic beginner mistakes that one can beyond doubt avoid.
As a quick introduction, the most oftentimes used and easiest-accessible welding processes are arc welding/gas welding (including tig welding and mig welding).
Wind Shield
Arc welding describes welding processes that use a welding power supply to originate an galvanic arc between an electrode and the base material to melt the metals at the welding point. They can use either direct (Dc) or alternating (Ac) current, and consumable or non-consumable electrodes. The welding region is sometimes protected by a kind of inert or semi-inert gas, known as a shielding gas, and/or filler material. Arc welding is widely used because of its low capital and running costs.
Mig (Metal Inert Gas) and Tig (gas tungsten arc) welding are kinds of gas metal arc welding. While Mig and Tig welding, continuous and consumable wire electrodes and a shielding gas are fed through a welding gun. Constant voltage, direct current power source are commonly used with Mig and Tig welding, but alternating current sources can also be used. Originally used for welding aluminiums, gas metal arc welding was also soon applied to steels because it allowed to cut welding time substantially.
Some advantages of Mig welding are that it is easier to learn, longer welds can be made without the need to stop and restart, and small post weld cleaning is necessary. The downsides are an oxidized weld deposit, unstable arc, and weld porosity. Advantages of Tig welding are that it allows welds of higher quality, with or without filling metal, good control of heat, and low distortion. Some of the issues with Tig welding are a somewhat erratic (wandering) arc, a high electrode consumption, and a certain porosity of the weld.
Some of the most basic and frequent mistakes in (mainly Mig, since it is the most relevant for most readers) welding, from our caress and after full, research, are the following:
1) Not cleaning the parts and weld surfaces properly. As most experienced welders say, this is a very frequent beginner mistake. Any paint, dirt, and similar materials can lead to problems and a bad weld as a result.
2) Using the wrong kind of gas for gas welding. Many citizen will opt for cheap gas, which is however sometimes not a good idea. While uncomplicated Co2 is cheap, a mixed gas will often yield good results while Mig welding.
3) Wrong polarity. This can yield a bad-looking weld bead.
4) Wrong caress tip sizes.
5) Inadequate trip speed, i.e. Going too fast or too slow.
6) Insufficient shielding – e.g. Not blocking the wind while welding.
7) Welding too cool on a heavy piece of material, which results in a lack of fusion.
Underbuying, i.e. Picking a too small welding motor for the material thickness required.
9) Not maintaining the wire feeder’s wear components, like liners, caress tips, and other parts.
10) Mismatched filler material, i.e. Not having the right tensile strength.
For an in-depth report of these and numerous other welding mistakes, as well as many industrialized Mig and Tig welding tips and tricks, check out www.weldingsecretbook.com
Learn How To Weld or the Top 10 Welding Mistakes
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