Titanium argon gas welding, (TAG welding) or simply tag welding, is the precursor to the conventional welding, as we know it. To illustrate, imagine a lightbulb with a wire leading to it from a power source. Also, another wire leading away from it to the power source switch on the mains lights the bulb. Something similar happens in welding. A connection from the mains makes the electrode active.
Similarly with the workpiece. But the complete circuit is only when the electrode contacts the workpiece. With the establishment of the course, a current starts flowing. The wire needs to pull back a bit, causing an arc. A lightning bolt is also an example of an electric arc. A transformer establishes a circuit between both the electrode and the workpiece. The heat of the arc melts the metal in the wire. This metal deposit joins plates or repairs holes, etc. The problem is that surrounding oxygen also is part of the metal residue, weakening the weld by the bubbles that form in it.
The Evolution Of Welding
Hand sewn clothes gave way to the sewing machine. Hand-hewn logs to the lumber mill. Almost everything needs and has had to evolve for reasons of time-saving, less workforce, end quality: the result, a much higher efficiency.
In the field of arc welding, it is extremely critical that the finished weld is perfect. Welding is the glue that puts together the joints of the hull plating of a ship, the fuselage of a plane, spacecraft, etc. Any compromise on the quality of work can have fatal results on human life.
General welding techniques beset by inherent faults rule themselves out.
Here tag welding is the leading choice by far. It is in use for non-ferrous metals such as stainless steel, aluminum, magnesium. Modified methods have but, been in use for use with carbon content steel.
Pros Of TAG Welding
- Use of consumable electrodes is normal in general welding. Tag welding employs a non-consumable tungsten electrode.
- Protection of the area surrounding the arc from oxygen is by a shield of argon, an inert gas.
- The weld deposit is even.
- The weld is close-packed, very strong, and of very high quality.
- Automation of the process can in shipyards and other locations using computer-aided techniques. With this comes the elimination of the human hand.
There are three key areas of tag welding that need close attention.
To improve on the efficiency of tag welding, it is imperative that the conjoining pieces of the workpiece, the edges of the plates, and the parts have to be completely clean. Failing to do so, otherwise compromises the weld quality. First, the use of commercial solvents is employed to purge oils, chemicals, etc. Following this is to grit-blast followed by hand brushing.
The Tungsten Electrode
an inherent danger occurs when the heat supplied is higher than the tolerance of the tungsten electrode. Variations in the heat trigger tungsten spitting which occurs with traces of tungsten being include in the weld pool.
The Heat Source Of TAG Welding
the effect of current to has a bearing on the weld quality. Too low results in poor poor penetration and may cause the bead lifting off the surface. Too much and the weld bead grows spreads with too much penetration and an increase in spatter.
The future of welding is striding ahead. But there is a divide. Skilled welders who operate manually are still in high demand in manufacturing science. As for tag welding, it is the most prevalent as far as aluminum, chromium welding goes. Newer developments called SMAW, laser welding, specialized process friction stir welding and so on are gaining ground, although TAG remains at the forefront. Sources claim that business outlook will remain stabilized and sound in the years to come. The need of the hour is both skilled workers as well as experienced welding engineers.