Qualifying AC Wave technology

By rtrautman (*)

Date 03-06-2008 21:37

When you switch from standard AC to AC with Wave technology do you have to requalify? This is tested with Charpy's.

By Lawrence (*****)

Date 03-06-2008 22:02

Are you talking about SAW ?

By rtrautman (*)

Date 03-10-2008 13:27

Yes SAW, AC just as GRoberts is describing it in his post.

By GRoberts (***)

Date 03-06-2008 22:48

All AC is a wave. Standard AC (the old welding machines, and the kind that comes out of the wall) is a sine wave. A lot of AC machines now use square wave AC so that the arc is more stable, and it can be adjusted for frequency and percentage positive and negative. The AWS structural welding codes and ASME Section IX do not list this as an essential variable. In fact, with ASME, it is not even an essential variable to change from AC to DC. (It is a supplementary essential variable so that it affects your procedure with Charpys)