Inconel 718 Round bar can sustain upto 1300°F. It is used in power generation and to make engine piston and pump shaft. Typical specifications are AMS 5662 and ASTM B637.

One of the main reasons as to why the Inconel 718 square bar was developed was to enable good weldability characteristics amongst the various Inconel grades. Some Inconel grades such as Waspalloy and X-750 prove difficult to weld

That’s where Inconel 718 hex bar steps in. Inconel 718 does not pose problems such as difficulty in welding due to cracking as well as segregation of alloying elements in the heat-affected zone in the microstructure. Therefore, welding procedures such as the gas tungsten arc welding and electron beam welding techniques can be used to weld a UNS N07718 bar. In gas tungsten arc welding or what is shortened as GTAW, a non-consumable tungsten electrode can be used to produce the weld on these ASTM B637 round bars.

Which is why the gas tungsten arc welding technique is also referred to as a tungsten inert gas welding or TIG welding. Since the Inconel 718 rod is also used by the aerospace industry, it is only fitting that the gas tungsten arc technique be used to weld Inconel 718 components in this industry. However, it cannot be undermined that the high quality welds can be performed on the Inconel 718 flat bar with the use of this technique.