Today we are going to be discussing some tricks that you should know about when it comes to TIG welding hot rolled steel. Welding is defined as the process of joining two or more metal pieces or parts by heating the surfaces to the point of melting with the use of a blowtorch, electric arc, or other means. They can be united by pressing, hammering, etc. Welding has a lot of process that you can choose from, depending on what fits into the metal you are welding. We are going to be focusing on TIG welding today.
TIG stands for Tungsten Inert Gas (TIG) welding. It also has another name called as Gas Tungsten Arc Welding (GTAW). It is an arc process that uses a non-consumable tungsten electrode to produce the weld. In this process, you will be using an inert shielding gas which composes of argon or helium, and also a filler metal is also used in the process. There are some welds however that is called autogenous welds that do not require filler metals. You will need a constant current welding power supply to produce electrical energy, which is conducted across the arc through a column of highly ionized gas and metal vapors known as plasma. During TIG Welding one hand is used for holding the TIG torch that produces the arc and the other hand is used to add the filer metal to weld the joint. This is what makes TIG Welding hard because unlike other processes since it requires two hands.
TIG Welding was introduced during the year 1940s, and it was Helium gas which was first used as a shielding gas. Just so you know, Tungsten is what makes TIG welding possible. Tungsten is a very hard, and slightly radioactive brittle metal. Since it is radioactive, you must keep yourself protected so make sure that your complete Personal Protective Equipment.
If you are welding stainless steel, there’s nothing much that needs to change. You don’t even have to practice as much. You will need tungsten and argon gas. However, stainless steel will requires good gas coverage. Sometimes, you will need to submerge your weld in an Argon bath , and if it’s an open root weld the inside of the joint must be first purged with a filler gas. The only problem is that welding stainless steel has a tendency to wrap if you apply too much heat. You can control the distortion by staggering the welds and bracing the weld area frequently. To be sure that you have welded it proper, it usually has a copper color to it. However, if the weld is gray or dark, it means that either you are moving to slow or your heat is too hot.
Joint preparation is important when welding stainless steel. You must make sure that the joint is absolutely free of anything. You see if you are welding on an unclean steel joint, you will encounter problems. The filler wire won’t stick to many parts of the joint. In order to counter this, the best thing you can do is to hit the joint with a sanding disk or a file.
Next, if you are TIG Welding Aluminum. You will need to have pure Tungsten or Zirconium Tungsten. You need to form it into a ball shape at the end so that it will spread the heat properly. You will also need to adjust the current to alternating. Aluminum requires a high frequency start from either a high production button or a foot pedal operated TIG torch.
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