Patent ID: 8733128

Claim:
A method of making an edge seal for a VIG window unit, the method comprising: applying IR energy from at least one IR emitter operating at a first voltage for a first predetermined period of time of from 3-7 minutes to a frit material, wherein the frit material along with a plurality of spacers are located between first and second substrates; after the period of time of from 3-7 minutes, reducing the operating voltage of the IR emitter from the first voltage to a second voltage for a second predetermined period of time of from 2-4 minutes so as to reduce the IR energy impinging upon the frit material, the second voltage being between 25% and 75% of the first voltage; after the second period of time of from 2-4 minutes, increasing the operating voltage of the IR emitter from the second voltage to a third voltage for a third predetermined period of time of from 6-8 minutes so as increase the IR energy impinging upon the frit material; after the third period of time of from 6-8 minutes, oscillating the operating voltage of the IR emitter between a first threshold and a second threshold at least two times in forming the edge seal; and cooling or allowing the frit material to cool over a fourth period of time in making the VIG window unit.