It's back to back wins for the Mallards who now go unbeaten in 4 games.
Tillysburn proved a difficult venue last year with two defeats but there was no such worries today.
Joshua McIlwaine headed in a first half opener, not long after the Mallards had hit the crossbar from a corner.
Campbell, McEvoy, Cashel, McIlwaine and O'Reilly all spurned chances to extend the lead and as the second half progressed, it looked like that might cost the Mallards as the Welders continued to threaten.
Eventually Ryan Campbell notched up the second goal to seal a hard earned win.
There was also good news for the Reserves as their pre-season continued. Two Lee Frazer goals seen them defeat Fivemiletown 2-0 in a friendly on Fisher Park.