A caricature of the committee members voting on this would be a lemming headed toward a cliff. The fact that the New Farm Code blindly included the new filler metal specification is a disservice to the industry. They included 12 pages in the New Farm Code in their attempt to explain how to decipher the convoluted classification system specified by AWS A.36.
Dissecting the classification: Ten variables, count them! E S P TX - G H I - C -D Hx I substituted letters for "Xs" used by AWS' legend.
E- electrode - no brainer
S - tensile strength - 8 groupings
P - position - 0 or 1, no change
TX usability - 1 through 17 plus G if the electrode does not fall into a standard usability grouping
G - shielding gas - 17 different recognized gases and "Z" for any gas that is not included in a recognized gas or mix grouping. Includes 7 foot notes - really?
H - post weld heat treatment - they couldn't figure it out, so they refer the reader to A5.36 to figure it out on their own
I - notch toughness - 10 possible test temperatures, with Z indicating no impact testing is required, G if it is by agreement between supplier and user.
C - weld deposit chemistry - 38 different groupings
D - supplemental mechanical testing - low heat input / high heat input
Hx - diffusible hydrogen
How many different combinations are possible? How many WPSs will have to be written to cover the possible combinations? Will any welder really have a clue of what they are using? Are the electrode manufactures expected to test each electrode with each gas, in each post weld heat treated condition, will they actually test each electrode with high and low heat input? It boggles the mind.
How does this help anyone? I have not heard one answer from anyone that is in the "loop" that could explain the rational other than to harmonize with ISO.
The current system that is in place works. When I have a project that requires more specificity, I list the manufacturer and the "brand name". The new classification system included in A5.36 is simply too unwieldy. How many different classifications will be listed on the label? Unwieldy is as generous as I can get, but unusable is probably more accurate.
It is one more reason to toss the New Farm Code (formally AWS D1.1) into the circular file. Besides allowing one to weld on surfaces with residual oil, grease, water, and other hydrocarbons, the New Farm Code impose limitations of A5.36 as a condition for prequalified WPSs. Maybe the two committees were riding in the same bus that was involved in a horrible accident and they voted on these provisions while suffering head injuries. How else can one explain it? I just pray ASME doesn't fall down the same rabbit hole.
Best regards - Al