TIG welding (Tungsten Inert Gas Welding), also known as Non-Melting Extremely Inert Gas-Shielded ARC Welding. Whether it is manual welding or automatic welding of stainless steel with a thickness of 0.5 to 4.0 mm, TIG welding is the most commonly used welding method. TIG welding with filler wire is often used for bottoming welding of pressure vessels, because the better air tightness of TIG welding can reduce the porosity of the weld seam during welding of pressure vessels. The heat source of TIG welding is DC arc, the working voltage is 10-95 volts, but the current can reach 600 amps. The correct connection method of the welding machine is that the workpiece is connected to the positive pole of the power supply, and the tungsten pole in the welding torch is used as the negative pole. The inert gas is generally argon.
TIG welding, short for Tungsten Inert Gas Welding, is a welding process known for its precision and versatility. Also referred to as non-melting extremely inert gas shielded arc welding, it has earned its place as the go-to method for welding stainless steel with a thickness ranging from 0.5 to 4.0 millimeters. Whether applied manually or automatically, TIG welding has proven itself time and again in various applications.
One of the key reasons TIG welding is the preferred choice for stainless steel lies in its ability to maintain the integrity of the material. It's all about achieving a clean and precise weld. When you're working with stainless steel, especially in applications like pressure vessels, where air tightness is paramount, TIG welding with filler wire becomes indispensable.
In pressure vessel fabrication, TIG welding takes center stage for several critical reasons. Firstly, it offers exceptional control over the welding process, allowing operators to produce consistent, high-quality welds. This precision is vital in ensuring the weld seam's integrity, which directly influences the vessel's ability to maintain pressure and prevent leaks.
Additionally, TIG welding excels in reducing porosity, a common concern in pressure vessel welding. The choice of inert gas, typically argon, plays a pivotal role in this regard. Argon creates a stable and protective atmosphere around the welding arc, shielding it from atmospheric contaminants. As a result, the chances of porosity or other defects in the weld are significantly minimized.
The heat source in TIG welding is generated by a DC arc, with a working voltage ranging from 10 to 95 volts. Remarkably, the current can reach up to 600 amps, highlighting the versatility of this welding method. To ensure proper operation, it's crucial to connect the welding machine correctly. The workpiece should be connected to the positive pole of the power supply, while the tungsten electrode in the welding torch serves as the negative pole.
The role of the tungsten electrode, often made of pure tungsten or alloyed with other elements, is fundamental. It doesn't melt during the welding process and maintains its structural integrity, even under the intense heat of the welding arc. This stability and durability are essential for precise and consistent welds.
In conclusion, TIG welding is the gold standard when it comes to welding stainless steel, especially in applications like pressure vessel fabrication. Its precision, control, and ability to produce clean, high-quality welds make it the top choice for professionals across various industries. The use of inert gas, the correct polarity, and the remarkable heat range it offers all contribute to its effectiveness in creating reliable, airtight welds critical for ensuring the safety and functionality of pressure vessels and other stainless steel components.