Welding - How To Weld
Welcome to WeldingHowTo. This site is to provide welding information for both those who wish to learn how to weld, those who wish to move to another level and upgrade their skills, and people in metal fabrication and business seeking welding knowledge.
We often get calls from people seeking Welding Jobs
or in depth how to weld information without having to go to Welding School
or evening classes that are time consuming and can involve considerable travel. There are a few resources online available that can give pieces of information if you have the time to search, however there is one manual that is very comprehensive and covers all the methods, procedures and techniques for all types of welding check out our review of the Welding Secrets Manual
Basic Welding Procedures
All metals have different characteristics that affect their ability to be welded or cut. The welding process involves melting the base metal parts and adding filler metal that has the same melting temperature and characteristics of the parent metal.
Metals are divided into two categories, ferrous and non ferrous. Ferrous metals contain iron such as cast iron, mild steel, forged steel, and stainless steel. where as aluminum is a non- ferrous metal. Each metal type requires different welding procedures and filler rod metals.
These are the four major welding types
and processes that are used both in industry and for the home hobbyist.
Gas metal Arc Welding. (GMAW)
Also referred to as MIG Welding
or metal inert gas welding. The most versatile and most used of all the weld processes. Uses a continuous wire feed electrode fed through a welding gun along with a continuous flow of shielding gas.
The advantages of a mig welder are many, the gun is easy to manipulate and keep at a uniform distance from the work, a continuous wire feed allows longer welds to be run, the weld remain smooth and clean because of the shielding gas. Mig welders can operate at very low temperatures and is ideal for sheet metal work.
Disadvantages of a Mig are in outdoor situations where the shielding gas can be blown away in a breeze, and also in tight situations where the size of the gun nozzle limits maneuverability. Both situations can be overcome however by using gasless wire in the machine. Mig welding is ideal for welding mild steel, stainless steel and aluminum.
Mig welding is also one of the easier processes to learn .
Check here for welding helmets
Gas Tungsten Arc Welding (GTAW)
Also referred to as TIG or tungsten inert gas welding Tig welding is a process that generates an arc between a non consumable electrode and the work. The electrode and the weld are protected by a gas shield, and a filler rod may or may not be used.
is similar to gas welding but requires considerably more skill. Used for doing fine work and where a high standard of metal finishing is required without the need for excessive clean up, such as bicycle frames, furniture and food manufacturing equipment..
As Tig welding is a very clean process its ideal for stainless steel and aluminum.
Shielded Metal Arc Welding (SMAW)
Often referred to as a stick welder, arc weld involves heating the base metal to fusion by a thermal arc using a welding electrode. The covering on the electrode provides both a flux and shielding gas for the weld.. Electrodes range in thickness from 2 mm for light work and up to 5 mm for heavy steel.
Stick welding is used for steel fabrication, construction, and repair and maintenance work, more suited to metal thickness 4 mm and upwards. Thinner metals and aluminum are more suited to the GMAW process. See; how to weld aluminum.
Learning how to oxyacetylene weld is a relatively easy process to master and uses a gas flame to melt base metals and fuses them together. The gas flame is created by the combustion of oxygen and a fuel gas such as acetylene, propane, butane or natural gas. The hottest of any gas flame is capable of melting most metals.
Gas welding today is generally restricted to welding thin sheet metals (see also; how to spot weld) and brazing of mild steel, and copper pipe work. , Braze welding is used for joining dissimilar metals and metals of different thickness and often used to repair cracked or broken cast iron.
Other topics covered on this site include Plastic, laser, underwater and spot welding processes . We also have resources for welding equipment and supplies including metal working machinery and auto darkening Welding helmets.
With the relative scarcity of trained welders in many regions of the country welding can be a rewarding and exciting career. Personnel are sought after in feilds in civil construction, machinery, ship building, agriculture, food processing, automotive, furniture, technology and many more, so get out there and learn how to weld.