ASME BPVC SEC IX WLEDING_TRAINING
Part 3
'A' Number
This is related to the weld metal chemical composition that is the composition weld metal is having when it is welded to the base metal of similar properties.
'A' number can be found out from the table QW-442. Refer page number 143 (Of 2010 ed).
The weld metal composition can be found out from ASME BPVC Sec II C or from the catalog of the electrode/filler wire/rod. Get the chemical composition from any one of the methods and match with the chemical composition given in QW-442. The corresponding column in the left most side of the table will give you the 'A' number.
Some common 'A' number's which are easy to remember
'A' number = 1 for E6010, E6013, E7018, E70S-2
'A' number = 8 for E316, E308
### END OF PART 3 ###
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