In reading through AWS SFA-5.28, I cannot locate a reference to the testing frequency for the required tests shown in Table 5.  Can anyone point me to a source for this information?  For example, is testing only required during initial qualification of the consumable by the manufacturer or is it more frequent, such as per heat, batch, etc?  Material certifications for consumables will often report actual chemistry values but "typical" mechanical property data.  Does this imply that mechanical testing on a per heat, batch, or lot basis is only required when specified by the purchaser?  No where in the spec can I find any language regarding this subject.  Thanks in advance for any comments.