For conventional oil pipe welding, the quality is difficult to control, and it is difficult to achieve the required welding slag not allowed in the interior, however, more efficient and widely used welding backing is made by manual arc welding method to cover. In this way the welding operation is simple, the welding operation is simple, not easy to appear pores, slag, incomplete penetration and other welding defects, and because the line capacity is small, so heat affected zone is small, small deformation, cracking trend.
Tungsten inert gas welding abbreviation TIG (tungsten inert gas welding) welding. The tungsten arc generated by the electrode and the workpiece substrate and the hot-melt filler wire (filler wire, if used) is a welding method under the protection of an inert gas. Continuous welding of shielding gas from the torch nozzle, the arc formed around the protective layer and air gas isolation, to prevent the weld around the tungsten heat affected zone have a very harmful effect, allowing high-quality welding.
The welding technology of oil pipeline:
TIG welding advantages:
1) TIG welding can weld metals, etc., argon welding area can be effectively isolated from the surrounding air, it will not dissolve the metal, and metal does not respond. TIG welding process, arc welding and automatic removal of surface oxide film. Therefore, the success of other welding methods easy to oxidize easy welding, nitriding, chemical reactivity, nonferrous metals, stainless steel and various alloys.
2) the protection effect, the welding quality is high. Ar is one of the most stable and inert gases, it does not react with the metal reaction, soluble in liquid metal does not produce pores, and therefore has excellent protection properties. The welding process is basically a simple metal melting and crystallization process, so the welding quality is high.
3) As the argon gas flow to the arc compression and cooling, welding stress and deformation is small, the arc heat concentrated and high temperature argon, can ensure that the weld root penetration, heat affected zone joints small, welding distortion and cracking tendency. Particularly suitable for large-scale welding of steel air quenching tendencies.
4) tungsten arc stability, even in small welding current (<10A) is still under stable combustion, especially for thin, thin plate welding materials.
5) The heating and filling wires can be controlled, so easy to adjust the heat input can be welded in various locations, but also to achieve the ideal way to spray side welding.
6) Since the filler wire does not pass through the arc, no splashing or welding appearance is generated.
7) Ar is a single atomic gas, heat capacity is small, thermal efficiency is low, heat consumption is large, the arc stable combustion is very favorable, even in low current conditions and arc length, arc stable, easy to operate, easy to control the welding quality difficult pipe welding position All position welding.
TIG welding in recent years, because it is of good quality, easy to operate, it has become a power company in the boiler heating surface tube welding installation and maintenance of common methods. Under field maintenance conditions, the welding position is limited by space constraints. The most commonly used process methods are undercoating TIG welding SMAW covering the entire surface or using TIG welding.
0 comments:
Post a Comment