Navazhussain
Materials
- Sep 15, 2012
- 10
Can some one elaborate QW-404.12 of ASME IX with simple example
QW-404.12 A change in the filler metal classification within an SFA specification, or for a filler metal not covered by an SFA specification or a filler metal with a “G” suffix within an SFA specification, a change in the trade designation of the filler metal.
When a filler metal conforms to a filler metal classification, within an SFA specification, except for the “G” suffix classification, requalification is not required if a change is made in any of the following:
(a) from a f i l ler metal that is designated as moisture‐resistant to one that is not designated as moisture‐resistant and vice versa (i.e., from E7018R to E7018)
(b) from one diffusible hydrogen level to another (i.e., from E7018‐H8 to E7018‐H16)
(c) for carbon, low alloy, and stainless steel filler metals having the same minimum tensile strength and the same nominal chemical composition, a change from one low hydrogen coating type to another low hydrogen coating type (i.e., a change among EXX15, 16, or 18 or EXXX15, 16, or 17 classifications)
(d) from one position‐usability designation to another for flux‐cored electrodes (i.e., a change from E70T‐1 to E71T‐1 or vice versa)
(e) from a classification that requires impact testing to the same classification which has a suffix which indicates that impact testing was performed at a lower temperature or exhibited greater toughness at the required temperature or both, as compared to the classification which was used during procedure qualification (i.e., a change from E7018 to E7018‐1)
(f) from the classification qualified to another filler metal within the same SFA specification when the weld metal is exempt from Impact Testing by other Sections This exemption does not apply to hard‐facing and corrosion‐resistant overlays
QW-404.12 A change in the filler metal classification within an SFA specification, or for a filler metal not covered by an SFA specification or a filler metal with a “G” suffix within an SFA specification, a change in the trade designation of the filler metal.
When a filler metal conforms to a filler metal classification, within an SFA specification, except for the “G” suffix classification, requalification is not required if a change is made in any of the following:
(a) from a f i l ler metal that is designated as moisture‐resistant to one that is not designated as moisture‐resistant and vice versa (i.e., from E7018R to E7018)
(b) from one diffusible hydrogen level to another (i.e., from E7018‐H8 to E7018‐H16)
(c) for carbon, low alloy, and stainless steel filler metals having the same minimum tensile strength and the same nominal chemical composition, a change from one low hydrogen coating type to another low hydrogen coating type (i.e., a change among EXX15, 16, or 18 or EXXX15, 16, or 17 classifications)
(d) from one position‐usability designation to another for flux‐cored electrodes (i.e., a change from E70T‐1 to E71T‐1 or vice versa)
(e) from a classification that requires impact testing to the same classification which has a suffix which indicates that impact testing was performed at a lower temperature or exhibited greater toughness at the required temperature or both, as compared to the classification which was used during procedure qualification (i.e., a change from E7018 to E7018‐1)
(f) from the classification qualified to another filler metal within the same SFA specification when the weld metal is exempt from Impact Testing by other Sections This exemption does not apply to hard‐facing and corrosion‐resistant overlays
