26. (a) Is the same method used on aluminum as in cast iron in welding from the closed end, toward the open?
(b) Is this procedure necessary on preheated work?
27. (a) If a suspension arm, of a “U” type, on an aluminum crank case were to break about 3 or 4 inches from the body of the case, could it be welded in place without dismantling the motor?
(b) Explain in detail how such an arm should be welded.
28. Due to the contraction and expansion, it is very difficult to have the bolt hole, in the end of an aluminum suspension arm that has been welded, return exactly to its former position. How is this difficulty provided for?
29. (a) Should a section of an aluminum crank case be missing, would it be advisable to build up a new part with the “filler-rod” or to cast a new part in a mold and then weld it in?
(b) Under what conditions should the above be done?
30. (a) If it were found that an aluminum crank case after being welded, had one corner about ¹⁄₈-inch lower than the rest of the case and it had not affected any of the bearings, could it still be reclaimed?
(b) Give procedure.