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Wayne, If the cover isn't stressed much, I would just braze it. If it see's a pretty good load, then weld it. Go to your local welding supply house and buy the rods and they will give you specific instructions. Whether brazing or welding, you need to thoroughly clean the area, grind a "vee" along the crack, drill a small hole at the ends of the crack. Pre-heat the weld area with an acetylene torch to about 400 degrees--ask the folks who sell the rods about pre-heat, some will say this isn't necessary but I would recommend it. You can also buy a "temperature pencil" or "heat stick" as some call it that will provide indication of surface temp when it's rubbed on the heated area. Keep in mind, if you do decide to braze the area and it doesn't work out, it's almost impossible to remove the brass filler material from the repair area once it's done. With welding, it's easier to grind away the filler material and redo the weld. When you do the welding it's best to do small sections at a time--don't try to weld the entire length. Also, keep the area heated above the ambient temp with the torch so you don't strike the arc on "cold" iron. Last comment--before I welded on anything of value, I would get a piece of "junk iron", say an old engine block that's cracked or something else and practice the welding procedure, before I attempted to do it on something you need or want to keep.
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