Irrigation pipe doesn't have hot oil flowing through it. JB weld holds for a little while, and then it comes loose. I've used a procedure called 'sewing" with a line of overlapping drilled and tapped holes and plugs to repair freeze-cracked engine blocks for over 50 years. Find both ends of the crack, and drill 1/8" holes to prevent it from spreading further. Drill and tap the center of the crack for a 1/8" NPT plug, install a plug with red Loctite, and grind it flush. Drill and tap a series of overlapping holes and plug them in both directions until you run out of crack. No welding, and it's a permanent repair. It works on cast iron and aluminum- - - - -just use the appropriate material plugs.
Jerry
