Welding is a complex subject, and this article is far from being comprehensive. However, one thing it tries to cover is some absolutely necessary requirements and many basic beginner mistakes that people can easily avoid.
As a quick introduction, the most common and readily available welding processes are arc welding/gas welding [including argon arc welding and partial welding].
Arc welding describes a welding process that uses a welding power source to create an arc between the electrode and the substrate to melt the metal at the weld. They can use direct current [DC] or alternating current [AC] currents, as well as consumables or non-consumable electrodes. The weld zone is sometimes protected by an inert or semi-inert gas called a shielding gas and/or a packing material. Arc welding is widely used due to its low capital and operating costs.
MIG [Metal Inert Gas] and TIG [Gas Tungsten Arc] welding are various gas shielded metal arc welding. During MIG and TIG welding, continuous and consumable wire and shielding gases are supplied through the torch. Constant voltage, DC power is usually used with MIG and TIG welding, but AC power can also be used. Originally used for welding aluminum, gas metal arc welding is also quickly applied to steel because it can greatly reduce welding time.
Some of the advantages of MIG soldering are that it is easier to learn, can be soldered longer without stopping and restarting, and requires less post-weld cleaning. Disadvantages are oxidized weld deposits, unstable arcs and welded voids. The advantage of TIG soldering is that it allows for higher quality soldering, with or without filler metal, good thermal control and low distortion. Some of the problems with TIG welding are a little unstable [drift] arc, high electrode consumption and a certain porosity of the weld.
Based on our experience and extensive research, some of the most basic and common mistakes [mainly MIG, as it is most relevant to most readers] are soldered as follows:
1] Do not clean parts and soldering surfaces properly. As most experienced welders say, this is a very frequent beginner mistake. Any paint, dirt and similar materials can cause problems and lead to poor soldering.
2] Gas welding using the wrong gas. Many people choose cheap natural gas, but this is sometimes not a good idea. Although simple carbon dioxide is cheap, mixed gases usually produce better results when MIG welding.
3] The polarity is wrong. This produces a weld that looks bad.
4] The contact tip size is wrong.
5] The speed of travel is insufficient, that is, walking too fast or too slow.
6] Insufficient shielding - for example, it does not block the wind during welding.
7] Welding on bulk material is too cold, resulting in insufficient fusion.
8] Insufficient purchase, that is, selecting a welding machine that is too small depending on the required material thickness.
9] Do not maintain the wear parts of the wire feeder, such as gaskets, contact tips and other components.
10] The filler does not match, ie does not have the correct tensile strength.
For an in-depth look at these and many other soldering errors, as well as many advanced MIG and TIG soldering tips and tricks, visit www.weldingsecretbook.com
Orignal From: Learn how to solder or top ten soldering errors
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