nashua wood stove repair.

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I've been asked to weld a couple cracks on an old nashua nfp-2 woodstove.  The cracks are right on the front...two on the hinge side and one at the bottom right of the door opening.  The only specs I can find are from an old ad, it says "constructed of heavy boilerplate".  Boilerplate seems to encompass a range of different steels.  I don't know the specific grade.  I plan on drilling the ends of the cracks...grooving them out with a die grinder....welding them up with 7018 and grinding it flush. Unless....someone thinks a different rod would be a better choice?  I'm open to advice...The model (stock pic) http://i1094.photobucket.com/albums/...Tg4OS5qcGc.jpgCracks on the hinge side of the door opening. http://i1094.photobucket.com/albums/...A5NjguanBn.jpgOther side... http://i1094.photobucket.com/albums/...A5NjcuanBn.jpg Tough to see in the pics.  Sorry about the links...last time I tried to link the pics direct it didn't work...Lincoln Ranger 250gxtLN-25Victor OA cutting torchMilwaukee mag-drillMilwaukee 6370-21 metal saw
Reply:I use 309 on something like this usually, bites in good and havent had one crack afterwards, but im sure 7018 is fine for the application,  even 8018