Selecting Filler Metals: Low Hydrogen
(60 votes)Welding Quality
This is part two in a series on selecting filler metals. When selecting filler metals, the specifier may elect to require “low hydrogen electrodes.” Such electrodes may be required to minimize the possibility of hydrogen related cracking. In some cases the engineer may specify low hydrogen electrodes because he believes these electrodes will also provide weld deposits exhibiting a high minimum level of notch toughness. While this may be true, it can not be assumed.
This article will address specifying filler metals that resist hydrogen related cracking while also providing good mechanical properties. The term “low hydrogen” has been around for about 60 years. It was first introduced to differentiate this classification of shielded metal arc welding (SMAW) electrode (e.g., E7018) from other non-low hydrogen SMAW electrodes (e.g., E6010). They were created to avoid hydrogen cracking on high strength steels, such as armor plate.1
Confusion About the Term
Although so-called “low hydrogen electrodes” have been around for many years, there is some confusion about what is meant by the term. Many codes and specifications use the designation, however, neither “low hydrogen” nor “low hydrogen electrodes” are listed in the American Welding Society’s (AWS) Standard Welding Terms & Definitions (AWS A3.0-94)2.
This may come as a surprise to some, especially to engineers that have been specifying that “only low hydrogen electrodes shall be permitted,” or “all welds shall be low hydrogen”, or that “all welding processes shall be low hydrogen.” Without a formal definition, the term “low hydrogen” can be understood differently by engineers, contractors, or inspectors, which can lead to confusion and conflicts.
by R. Scott Funderburk
metals, the specifier may elect to. require “low hydrogen electrodes.” Such electrodes may filler metals that resist hydrogen relat- ed cracking while also
http://www.jflf.org/pdfs/papers/keyconcepts5.pdf
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Specific low-alloy shielded metal arc welding (SMAW) electrodes and flux-cored (FCAW) wires do just that. To select low-alloy filler metals, it is first important to
http://www.coalpowermag.com/ops_and_maintenance/The-Low-Down-on-Low-Alloy-Filler-Metals_148.html
The lowdown on low-alloy filler metals – Arc Welding Tech
Home \ Arc Welding \ Articles \ The lowdown on low-alloy filler metals To select low-alloy filler metals, it is important first to understand chrome-moly pipe itself.
http://www.thefabricator.com/article/arcwelding/the-lowdown-on-low-alloy-filler-metals
FAQ on Weld Stress and Filler Metals
Low-hydrogen processes include: properly stored, low-hydrogen SMAW electrodes classified The key points to understand about filler metal selection are:
http://weldingdesign.com/welding-qa/post-weld-stress-relief/
Hobart Brothers ” Blog Archive ” Filler Metal Options for
They provide the low carbon, low hydrogen properties that prevent Mind Your Ps’ To select low alloy filler metals, it is first important to understand
http://www.hobartbrothers.com/aboutus/fillermetals_chromemoly_pipe/
Cracking the case – Consumables Tech Cell – TheFabricator.com
Beyond Filler Metal: What You Should Know Before Making a Selection As a rule, filler metals with low tensile strengths and low hydrogen will yield the best
http://www.thefabricator.com/article/consumables/cracking-the-case
