The method you select for welding pipe will depend on the location where the welding is taking place, materials and pipe size.
For welding steel pipes in the open (e.g. pipe installation in trenches), manual arc welding (SMAW) is most common. This technique used is downhill using cellulosic electrodes (also basic electrodes are used for higher strength steel applications). A root pass and a hot pass are followed by the fill passes. The weld is finalized by the top pass. Welding units optimised for downhill welding are utilised.
Welding Smaller Pipes
For small diameter and short length pipes which are free to rotate, the pipe is rotated while the welding torch is held stationary. The processes used are MIG (GMAW) and TIG (GTAW). In the case of TIG welding a wire feeder is necessary. A process cell is best for this type of welding.
Welding Large Pipes
In applications involving larger pipe sizes, welding is generally carried out using the orbital process. MIG is usually employed, but TIG with automatic feed of the filler wire can also be used. Orbital process using closed head welding units is also utilized for applications where smaller pipes cannot be rotated.
There are a number of advanced methods of depositing pipe welds currently in use. These include precisely controlled short circuit transfer for root pass (Miller – Regulated Metal Deposition), optimized pulsed welding (Miller – Pro-Pulse) and high frequency waveform control (Lincoln – Surface Tension Transfer) in order to speed up and improve the quality of the pipe welds.
Red-D-Arc has a wide range of pipe welding equipment for rent including the following:
Red-D-Arc will be at the Fabtech 2018 Tradeshow in Toronto from June 12-14, 2018. Drop by our booth to view some of our latest rental offerings. You can find us at booth #1381
Our display will be part of the Air Liquide’s presentation which will include filler metals, welding gases, and safety products. A limited number of free samples of BLUESHIELD abrasives will be available as well. Drop by early to make sure you get one.
Win a Welder or Plasma Cutter
Visitors to the Air Liquide display will be able to complete a brief survey for a chance to win one of 2 machines:
Dry ice blasting is a state-of-the-art cleaning method that can save time and money — typically the cleanup can be accomplished in one third the time of traditional cleaning methods and, even more important, the cleaning job is more thorough, especially in hard to reach places.
Powerful, non-destructive blast cleaning with minimal cleanup
Dry ice cleaning uses recycled CO2 in the form of solid dry ice particles as the cleaning media. There are a range of intensity settings available, depending on the application, ranging from deep, powerful surface cleaning to extremely fine settings for jobs requiring light cleaning. Dry ice is non-abrasive to most surfaces and can be used around delicate components, including electronics, which would be damaged by water or solvents. Dry ice turns to a gas after contact with the surface being cleaned — clean-up time is kept to a minimum and there is no waste material to dispose of.
“Dry ice is non-abrasive to most surfaces and can be used around delicate components, including electronics”
Recovery from floods, spills or fires
For disaster recovery such as floods, spills or fires is sometimes a requirement dry ice blasting can be a very effective and powerful cleaning solution helping you get operations running quickly. If you have to deal with the aftermath of fire, smoke, or water damage, it can powerfully clean a variety of surfaces without damaging them. It is also an effective way to remove black mold.
Key Benefits of Dry Ice Blasting:
reduced cleaning time
no waste to clean up from the CO2
no toxic chemicals
99% mold spore removal on wood when IAQA standards are followed
Airgas, an Air Liquide company, is the nation's leading single-source supplier of gases, welding and safety products. Known locally nationwide, our distribution network serves more than one million customers of all sizes with a broad offering of top-quality products and unmatched expertise.