WELDING
HotPurge pipe purging systems for pre-heated pipe welding
TM T
hick wall chrome steel pipe joints, as used in the power industry for high pressure high strength
pipe work, need to be pre-heated for welding and probably need a post weld heat treatment too.Weld joints of this nature need to be purged of oxygen and welded in an inert gas atmosphere, to prevent oxidation, slag formation etc., that leads to loss of corrosion resistance and undesirable change to the metallurgy. With the high temperatures
and length of time at temperature needed in the pre-heat, weld and post heat treat cycles, most weld purging systems are unsuitable. However, Huntingdon Fusion Techniques, HFT®, has now developed “HotPurgeTM
Argweld® HotPurge™
Heat resistant inflatable pipe weld purging systems incorporating RootGlo®
, IntaCal® PurgeGate® ” a system
for use up to 300oC (572oF) for 24 hours. (The material used is rated up to 700oC (1,292oF) HotPurge is based on the company’s world famous Purge
2 that has been in wide use for many years, but adapted for use at high temperatures. This system is available for pipe internal diameters (i.d.) from 4 – 96” (100 – 2,500 mm). Each HotpurgeTM
has a tolerance of +/- 1⁄2” (12 mm) because of the restrictions of heat proofing material. Features of the HotPurgeTM
are listed below. 1.0 The central large collar that
dramatically reduces the space to be purged and makes it easier to reach the lower oxygen levels faster. 2.0 Four pull handles are securely
is made to size and
attached to each dam, secured with the Kevlar thread that will withstand a pulling force of 1.000 lbs on each handle. 3.0 The most stunning feature of the the HotPurgeTM system is the PurgeGate® to prevent over inflation.
New malleable cast iron clamping squares
Strong Hand Tools®, manufacturer of innovative Strong Hand Tools® Welding Clamps, Magnets, Pliers and BuildPro™ Welding Tables, is proud to introduce the New BuildPro malleable cast iron clamping squares. The 4-face Heavy Duty (HD) clamping squares feature a total of 26 mounting holes over three surfaces for unlimited options in fixturing with the BuildPro modular welding tables. These new HD clamping squares are compact, and easy to handle with a slim, space saving profile that saves valuable tabletop space. Use the 26 mounting holes to stop, locate, clamp, or square up stock at 90°. An extra long mounting slot allows for adjustable mounting,
14 IMT February/March 2014
and can easily accommodate two mounting bolts for greater stability. Insert BuildPro clamps into the mounting holes on the two side walls or the top surface of the clamping squares for vertical or horizontal hold down clamping. The BuildPro malleable cast iron clamping squares are available in left and right facing models. BuildPro modular welding tables feature a tabletop surface of CNC machined 5/8 holes in a 2” grid pattern on precision ground steel plates for fixturing at any point on the table.
More information on Strong Hand Tools™
pam@stronghandtools.com www.stronghandtools.com
www.internationalmetaltube.com and
PurgeGate® is a clever, world wide patented invention that allows users to simply connect the system or any source of compressed inert gas and simply turn it on to whatever flow or pressure they wish. The system will protect the dams from over inflation or bursting and allow the user to deliver flow they like, using the one gas source. No matter how high the user raises the pressure in order to deliver more flow Purgegate prevents the pressure going to the inflatable dams, but allows the increases flow to make a faster purge. HotPurgeTM
pipe purging
systems can be used over and over again for specialist weld purges on power industry piping, that will keep the oxygen levels below 100 parts per million throughout the welding cycle.
More information from Huntingdon Fusion Techniques
rasewell@huntingdonfusion.com
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