Welding is a very important part of our lives as almost everything that surrounds us were welded. Those things include your car, kettle, gas cylinder, and lot more. As a novice to welding, you are very crucial to keeping this important aspect of our everyday life.
Basically, the act of forming one single bond of metal from two individual metals is called welding. Welding is a process that involves heat. This heat used for melting the metals is generated by the equipment known as Gun. If you must master welding of any pieces of metal it is very important to know, master, and understand how your equipment works.
A TYPICAL EXAMPLE OF A GUN
BEFORE YOU WELD
It is an outright advantage if you know how to carry and properly handle your equipment. Hence, it is necessary that you should practice very well with them before carrying out a proper welding exercise.
Practice how to carry the gun without actually welding. Holding up the barrel with one hand and at the same time supporting the same hand on your work table. The other hand should be used for operating the gun trigger. Choose a standing or sitting posture that makes you feel comfortable and steadily move the gun over your imaginary work surface. Repeat the exercise until it feels natural. Using some pieces of metal, you can carry out the experiment this time using live fire. Position the gun so that the lead wire meets the weld surface at an angle of 30 degrees touching the welded surface, mildly with the lead, squeeze the trigger, and gently pull back the gun. The wire should melt into the weld puddle and consequentially produce a crack like noise. After cooling you should have a welded metal. If you succeed with the later experiment, then you would have had your first welding experiment.
Welding can be grouped into kinds and for starters, there are four basic kinds of welding. These include:
- Flux-cored; and
Although, there are inevitable exercises, such as holding up your gun against the work surface. There are methods, techniques and processes for welding metals which are usually dependent on their mode of application: type of metal to be welded and the experience and skill fullness of the welder.
For all types of welding the following process is universal and applicable:
PREPARING THE METALS:
Whatever metal is to be welded has to be prepared before welding. This could be accomplished by marking outlines with the carbon scribe or woodworker’s awl and cutting off the irrelevant parts of the metals. To smoothen out the part that is to be welded, it would be necessary to file or grind the irregularities on the metals.
POSITION YOUR PIECE:
Building a project like the table would require right placing of the metals in the position the finished project should look like. To achieve this you need to do some measurements. For instance, welding the metals at exactly 90 degree to each other.
This is simply putting pieces of metals together with some sort of temporary bond. And then to examining if they fit properly or square into the right position, or whether or not they would need some adjustment.
After tacking the metals into place and squaring out the positions, the metals should be in the desired position. At this point, you can place your final or permanent welds. As much as it is a delightful experience to weld, try to avoid the temptation of overdoing it. As the more you weld the more metal you deposit and as a result, the more you’ll need to file or grind off.
After understanding the basic process of welding, it is important to understand the kinds of welding. As mentioned above, there are four major kinds of welding. These types of weld are explained below.
This is the ideal welding any novice welder should practice before proceeding to a more complicated welding. The metal inert gas (MIG) is also known as the gas metal arc welding (GMAW). It is a type of welding that relies on creating an electrical circuit that runs through the object to be welded. It also makes use of a welding wire that acts as an electrode.
The touching of the wire on the welding surface completes the circuit. The pulling back of the wire at a very short distance causes an electric arc that heats up to thousands of degrees In Fahrenheit. This heat sufficiently melts that wire, and partially melts the two pieces of metals creating a puddle that unites and solidifies the metal upon its cooling.
The Tungsten Inert Gas (TIG) also referred to as Gas Tungsten arc welding (GTAW), can be used in welding aluminum and alloys. It is the kind of welding that requires more skills. It also consumes a larger amount of time than the MIG welding. It has the advantage of more precision than the MIG.
Although the TIG welding shares similarities with the MIG, it still has a few differences. The MIG uses consumable wires, but the TIG uses a tungsten metal rod inside the welding gun. This gun is held with one hand and other hand feed the filler rod. A melt puddle is created by the arc from the two workpieces. The heats from the puddle melt the filter rod; hence mixing all three in the puddle.
Flux-cored welding (FCAW) is a kind of welding that makes use of a continuously fed electrode tube instead of a wire which is used in the MIG welding. The outer part of this tube is made of metals. Just like its name, it has a core that is made of flux. The flux melts during the welding process. It also creates a liquid slag and gas that protects the weld from contaminants.
This welding is also referred to as the shielded metal arc welding (SMAW). It can be called the two-handed methods and likened to the TIG as it also uses a metal filler stick (Rod) that has a coat of flux. This coat melts as the sticker material also melts in the heat. The melting produces gas and liquid slag, which protects the welds from oxidation.
Welding materials can only be considered after the welding method. That which will be used would vary in the different welding process.