those more than likely go through the stringers.they hold the inner structure to the hull.it keeps the bottom of the hull from flexing in and a place to mount the floor and fill with foam.
keep a close eye on the cracks so they dont spread anymore.maybe a little jb weld around them will keep you going till winter.but will make the welders job a lot harder.he has to clean the stuff off to weld the hull.
you might save some change by pulling the decks up and removing the foam around the cracks.get enough room around them for a tig/mig torch to get in there.the foam can be put back with a spray can stuff.just dont overfill the void.remove just enough to work.
and make sure they use a tig welder on the cracks.that is the proper welder to use on aluminum.if the specs are the same as the 2000 models,hull thickness is .072" and 5052 grade aluminum.the welder will need to know this info so he uses the right filler material.he has to use 5052 filler on 5052 aluminum.this way the filler is of the same material as the parent metal,or bad things could happen.also use 5056h2 rivets in the hull where they are to be replaced.use 1/4" rivets in the stringers,which they should be already.if not they are 3/16".do not use pop rivets here,use solid rivets for these areas for watertightness.
i sort of went through the same thing with my boat.tracker welded a crack on my hull and replaced a few rivets in the stringers.they welded the crack from the inside of the hull.i wouldnt let them weld the stringer to the hull as the hull needs to flex a small bit.if they were welded solid they might rip off the hull and get a bigger hole in it where the weld was.also dont try to weld the rivets to the hull.it wont work too good,and be more of a problem than a soloution.
call tracker and ask where they have a repair center close to you,like a factory authorized service center for aluminum boats.they should be able to tell you that,or the local dealer should be able to help you out,or give ken(black flies) neeley a e-mail.he could get you the info,sorry ken,i had to!!
greg,the voices are telling me to go fishing this weekend!!should i listen to them???trying to talk mommy into a rally trip in april.its not working too good.shes being stubborn as usual!!the voices are telling me to go anyway!!