Gordon
My experience in this field suggest if you are going to partially reweld your crack, counter sink a hole at both ends this will stop the crack from chasing.
When it comes to the welding side make sure you weld your repair with stringer beads keeping them as small as possable, 2.5mm...
cromolly:-
Chrome is used as it is resistant to corrosion and is very strong.
Molly= Mollibrium (SPELLING UNCHECKED) has properties that have great CREEP resistance, resisting being pulled a part hence ATV FRAMES strong durable and life span many more folds than M/Steel
Calling 513613, Thankyou. You will have to conduct another vacuum box test on your horizontals when all welding is complete. Tig welding would be the way to go as you can control the size of the heat effected zone more easily when coming to fit your Boublers rather than stick Welding.After...
concrete is not a good conductor of heat and would be very costly to heat your room/rooms. However if you clad your floor with polystyrene the heat retention would make it worth while