And despite the mixed emotions of winning his first cap in a losing side Welsh said the experience of playing against the Italians in the RaboDirect PRO12 had made it an easier transition.
Glasgow had seven representatives in the squad along with Welsh and the loosehead prop said his club teammates had rallied round the newbie.
"It was a much higher standard but that was always going to be the case but I never felt out of place," he said.
"I play alongside the likes of John Barclay, Richie Gray, Ally Kellock week in week out so I was familiar with those guys who helped me massively on the pitch.
"The Italians we have had a season or two of playing against them so I didn't feel out of place at all, it was just unfortunate we didn't get it."
With the emotion of the Six Nations now gone it is back to the responsibility of the league for the Warriors on international duty with Aironi coming up on March 23.
And Welsh insisted that their focus was now fully on making the RaboDirect PRO12 play-offs where they currently lie fourth with a one-point lead over Ulster.
"The Six Nations is over now and we are back to the club and at Glasgow we are fighting absolutely tooth and nail to get into these play-offs and go as far as we can," he added.
"We have Aironi and then Cardiff so they are two massive games we are gearing up to so it is just straight back on the club scene again."
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