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Welding Tips Nine% Nickel Steels

Advanced TIP TIG Welding
TIP TIG Welding is always better quality than TIG and 100 to 500% faster with superior quality than TIG - MIG - FCAW.

 
 
   

 




www.weldreality.com

Written by Ed Craig EMail ecraig@weldreality.com



THE TIP TIG PROCESS IS NOW AVAILABLE IN NORTH AMERICA.



TIP TIG enables superior nickel quality welds
than TIG welds at Pulsed MIG wire feed rates
.




If you want all position, defect free welds at superior quality than conventional TIG, Pulsed MIG or the flux cored process and you would like to produce all position weld deposition rates equal to pulsed MIG and flux cored, consider the TIP TIG process. A five minute TIP TIG demo will show any weld professional that when welding in any weld position, thin or thick metals, any alloys and any weld, clad or brazed application, the TIP TIGprocess is the world's most cost effective process for producing defect free welds.



THE NORTH AMERICAN, PATENT PENDING, ADVANCED TIP TIG PROCESS, IS THE WORLD'S MOST EFFECTIVE WELD, CLAD AND BRAZING PROCESS. TIP TIG IS AN EASY PROCESS TO USE AND ALWAYS DELIVERS SUPERIOR WELD QUALITY THAN TRADITIONAL TIG / PLASMA WELDS. THE BONUS FOR THE WELD SHOP IS WHILE GETTING THE ULTIMATE IN TIG WELD QUALITY, YOU ARE GETTING IT 4 TO 8 TIMES FASTER THAN A TIG WELD:


The semiautomatic
TIP TIG process can be used with either TIG - Plasma or a laser. TIP TIG will always result in superior weld / clad quality and superior mechanical properties. It does not matter what the application, the weld position, or the alloy to be welded is, TIP TIG will deliver the ultimate attainable weld quality on all Carbon Steels, Stainless, Aluminum, Inconel, Titanium, Hastelloy, Stellite, Duplex, Low and High Alloy Steels, Tool Steels and Cast Steel welds and clad applications.



The Fossil and Nuclear industry will never attain the construction weld quality or productivity (10 to 40 times faster than manual TIG) that the ATT manual and automated weld process can deliver. Oil Platforms - Ship Yards - Naval Vessels and Submarines - The Space and Aircraft Industries - Cryogenic Vessels - Petro Chemical - Refining - Waste to Energy - Industrial Processing - Pulp and Paper - Military Equipment - Medical Equipment - Food and Beverage, none of the North American industries have in their weld shops a weld process that can deliver the weld quality / productivity attainable from the easy to use, semiautomatic ATT process.


It does not matter what the metal to be welded is, or the degree of all position weld difficulty. No other available global weld / clad process, will compete with the TIP TIG process in delivering the combination of defect free welds, optimum external weld quality, optimum mechanical properties with cost effective weld deposition rates.

Why be concerned about the skilled welder shortage when the moderate priced TIP TIG process is easy to use on the most difficult applications. PQR's will be easy to produce as two simple amp / wire feed weld procedures will weld most of your manual or automated applications. It takes about one hour to learn the one handed TIP TIG techniques. TIP TIG will dramatically reduce your weld rework costs and reduce your product liability concerns as it always will deliver the optimum in weld quality. There is no weld smoke issues and no concerns for spatter. In contrast to most other process it will provide less weld heat input. . If highly cost effective, defect free welds with superior weld appearance are important to you. Click for TIP TIG weld information.

 

 

WELDING, NINE PERCENT NICKEL
CRYOGENIC APPLICATIONS.



A common application in which austenitic stainless and 9% nickel steels is in the construction of cryogenic, liquefied natural gas (LNG) containers. These containers can carry liquid argon, natural gas, helium, oxygen, nitrogen etc. These liquid gases are usually in an approximate temp range of -300 to -450F. Carbon steels and alloy steels have poor toughness and ductility at low temperatures. The alloy steels with nickel, austenitic steels typically 304 - 304L 316 - 316L - 347 and aluminum alloys all have excellent low temperature toughness.

Strict welding regulations are applied to welding cryogenic applications. The weld metal properties should contain low nitrogen, low ferrite, low carbon and high nickel. Filler metals such as Nickel Chrome Molybdenum, Nickel Chrome Iron or high alloy austenitic electrodes.The Nickel alloy consumables have a coefficient of thermal expansion that is close to the 9% nickel this reduces the risk of thermal fatigue in applications subject to thermal cycling. Typically the mechanical properties of nine percent nickel will be higher than those of the weld consumables utilized. This requires special consideration to weld qualification tests.

Note that with the 30X in centrast to the 30XL (low carbon grades). The higher the carbon the lower the impact toughness.Shop built stainless steel cryo vessels in the USA are built to ASME Boiler Pressure Vessel Code Section V111. Field erected vessels may use the API 620 Q. Austenitic stainless accounts for the majority of metals used for cryo applications. The rest of the applications use 5 to 9% nickel or aluminum. Where high strength is required nine nickel may be chosen instead of an austenitic steel. Its important to remember that nine percent nickel is an alloy that can rust.




WELDING AFFECTS ON STAINLESS STEEL AND NINE PERCENT NICKEL

  • Keep the carbon in the rage <0.03%. Low carbon superior toughness.

  • With SMAW, Lime electrodes provide higher low temp toughness than the titania electrodes.

  • Weld Inclusions. Slag inclusion can lower low temp toughness. Keep this in mind when comparing weld processes. The two best processes for toughness are GTAW and GMAW.

  • As porosity or inclusions are a result of an oxide reaction its logical when MIG welding to use a low reactive gas mix.For stainless applications forget that argon 2% oxygen mix recommended by the gas companies, use Ed's stainless mix, argon with 2 CO2, (more
    info at gas section, www.weldreality.com). The argon CO2 mix is much less oxidizing and does not have enough CO2 to add to the carbon content of the weld. Use TIP TIG weld with TIG quality at MIG wire feed rates with inert argon.

  • Nitrogen pick up will increase the strength of the stainless welds however it decrease the low temperature toughness.

  • If using SAW for stainless, its difficult to meet the weld impact requirements on
    applications below - 300 F, consider MIG.

  • If the stainless pipe ID root weld finish is important, automated TIG systems use low (none pulsed) current for the root.The fill passes can then if required be made with the MIG process. Argon and argon hydrogen mixes are used for the TIG welds.

  • Nine percent nickel is often used for economic reasons for large plate, cryo pressure vessel applications down to -320 As mentioned this metal can rust, so this alloy cannot be used on applications where contamination is a concern.

  • Nine percent nickel cryo vessels are built to ASME Boiler Pressure Vessel code SectionV111.

  • Two material specs are used for the common nickel plates.
    [1] ASTM SA 553/SA 553M Spec for pressure vessel plates. Alloy steels Quenched and tempered 8-9% Nickel.

    [2] ASTM SA 353/SA-353M Spec for pressure vessel plates. Alloy Steels Doubled Normalized and tempered.

  • ASTM. AS 553 and SA 353 have the same chemistry 8.5-9.5 nickel the yield strength of 353 is 75 ksi to 85 ksi for the 553.

  • Most pressure vessel plates are QT 553.

  • Use Ed's Nickel MIG gas mix visit the gas section at www.weldreality com for more info.


  • Weld consumables available from Sandvik, and Inco Alloy. Ni CR/ Ni Cr Fe/ Ni-Cr-Mo and 16.13 CMnW ( 16.5 Cr - 12.6 Ni - 6.9 Mn - W 3.3 bal Fe).

  • Weld procedure qualifications for 9% nickel according to section 1X of the boiler code requires impact test made at -320F or the lower operating temp. The impact test covers
    the weld d HAZ. Transverse tensile and bend tests are also req.

  • For more nickel data, visit Nickel Development Institute. Sandvik and Inco Alloy Intentional


    Note: A portion of this data is from an Avery and Parsons article. Weld Journal Nov 95.