Basics of Arc Welding

Welding is a very easy process to learn about. Arc welding and stick welding are one of the most basic and common welding techniques that are initially thought to every welding student. Arc welding can be thought in four basic steps.

Step1: Equip yourself with safety accessories before you enter the domain to weld. This is a must irrespective of what your experience in welding is. Even the most experienced, brilliant welder has to take care of safety precautions before he starts to weld.

Step2: Always work with clean metals. This is a preparatory stage of welding. Clean your work piece properly before you work upon it.

Step3: Check for the welding earth connection. Make sure it is good. You are mainly using electricity to carry out the task of welding and if your earth connection is not good enough, you are most likely to mess up the task. An area of potential problems can be eliminated

Step4: Strike the arc properly. This is one of the biggest concerns for any welder and there are only three possible ways to do it;

•    Flick up from an edge
•    Strike like a match/scratch it
•    Tap it straight down, then back up

Hold the rod as straight as possible.

galaticos, Friday, July 8, 2011

TIG Welding- A Concept

Accuracy, Precise results, ease of use, skilled craftsmanship, economical and profits. These are some of the basic requirements any company would basically look out for. And so does the mechanical industries. Mechanical industries require a lot of cutting and welding of metals and alloys for their manufacturing. In fact manufacturing is the backbone for profits for these mechanical industries and when it comes to welding, they prefer TIG welding. It is simply because TIG welding provides the most accurate welds and welding is something that has to be perfect and no one can tend to bend their expectations. TIG welding stands for Tungsten Inert Gas Welding.
TIG welding has several advantages. One among them is that it does not have flux and thus, we can weld components of appliances such as refrigerators. Welding can be done in different positions. There is no splatter effect during the welding procedure. It is highly precise in producing results and thus very helpful when thin metals are involved in the manufacturing procedure.
As they provide high quality precise results several industries prefer this welding technique. Some among them are chemical, aircraft, atomic and instrument manufacturing industries. TIG welding is preferred especially when non ferrous metals are involved in the manufacturing requirements.
Differences between TIG and MIG are as follows;
• Tig uses non consumable electrode method and MIG uses vice versa.
• Tig uses tungsten electrodes
• Tig uses constant current supply while MIG uses constant voltage supply
• Tig is used for high temperature applications

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MIG Welding and its Types
Metal Inert Gas in short term known as MIG welding. It is popularly known as Gas Metal Arc Welding. In Mig welding process the usage of aluminum alloy wire with the combination of filler material and electrode are used by the welders. The process is one of the easiest processes that one can learn to weld. As the welder is capable of meeting all the parameters of welds with the help of machine it can also be termed as semi-automatic weld.

Mig welding can be carried on at two different processes they are:

• Conventional Metal Inert Gas weld-
  In this process of welding it uses DC power source with constant voltage. As there is limitations for the spray transfer, for the arc current the welding has its lower limits. Since it is limited to certain range it can weld materials where the thickness being above 4 mm.
• Pulsed Metal Inert Gas weld-
  Here the passage of DC power source is retained at low and high intervals. When the welds are done at low current welders maintain the arc without transferring metals. And during the high current passage metals are transferred in spray mode. Therefore this makes Pulsed welding process to weld at high and low heat inputs which is not possible in conventional process. And the possibility of welding thinner materials is much easier at any positions.

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MIG welding equipment

MIG welding
is also known as metal oxide inert gas welding. It can be a semi automatic or an automatic arc welding process. There are many units available by many manufacturers today that cater to MIG welding. You should be sure as to where you choose your equipment that you want to buy from however. Normal parameters that you should look for your set up are if it is portable.

It should be able to fit in your workshop. Also the roll capacity of your equipment is important. For most operations, a 12lb machine should be good enough to keep you running back for more wire. Also if the unit has a flux core with optional drive rolls then it should be a good bargain for you.

Normally these machines also come with a spool gun that is attachable. This will help to weld materials like aluminum. Also if you are going out to buy such a machine, make sure that you look out for the arc force control feature. There are affordable pulse MIG welding machines available today. These will help in precision and also not burn a hole in your pocket at the same time. Invest r

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