Captain Katsumi Yusa (25th minute) opened the scoring before Norde struck a brace (45+1st and 52nd), while Jeje Lalpekhula (90+4th) completed an aggregate 7-2 rout at the Vidyasagar Krirangan.
The Mariners had a 3-2 win in Goa in the first-leg of the quarterfinal on Monday and they will clash against Shillong Lajong in the home and away leg semis on May 8 and 15.
Mohun Bagan almost sealed the deal in the first period with strikes from Norde and Yusa. A wonderful run by Norde followed by a patient shot at goal by an unmarked Katsumi gifted Mohun Bagan a handsome 2-0 lead in front of an attendance of 10,242.
A minute into the first-half injury time, Norde, who missed their last two matches including one in the AFC Cup because of his knee injury, showed his class as he collected a through-ball and sent it past the onrushing Salgaocar goalkeeper Karanjit Singh.
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Norde's brilliance was for all to see again when the Haitian beat Nicolau Colaco and surged across the 18-yard box to send a curling shot which hit the far post before finding the back of the net.
In the fourth minute of second-half injury time, Jeje completed the hammering with a solitary effort to beat Karanjit with ease.