5.17.1 General Requirements - "Tack welds and construction aid welds shall be made with a qualified or pre-qualified WPS and by qualified personnel."

I take "qualified or pre-qualified WPS" to implicitly mean that pre-heat is required for tack welds if pre-heat is required for the base metal.

Correct ?

Tack weld pre-heat would be particularly applicable to heavy member multi-pass tack welds and especially with certain filler metals.

Correct ?

The only exception tack weld pre-heat being when SAW will incorporate single-pass tack welds.

Correct ?