B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
B23K 9/23 (2006.01) B23K 9/02 (2006.01) B66C 9/10 (2006.01) B66C 9/16 (2006.01)
Patent
CA 2060469
The invention is an improved method for fabricating apparatus weldments such as, for example, wheeled end trucks for overhead cranes. The apparatus has a pair of spaced, wheeled end modules, a pair of beams extending between the modules and at least one reference such as a reference plane used to initially align end modules placed in a fixture prior to beam-module attachment by welding. The improved method includes the steps of positioning the modules with respect to the reference, tack welding each piece in position for permanent attachment to the modules and permanently attaching each piece to a module. Permanent attachment includes applying welds in sequence to the first end of one beam, to the second and first ends (in that order) of the second beam and, finally, to the second end of the first beam. Where each module-and-beam-end attachment has plural welding paths, preferred steps are described for the order in which each path at each beam end is to be welded. The effects of heat-induced piece distortion, which is unavoidable, are essentially canceled and misalignment in the finished apparatus is substantially avoided.
Christensen Jonathan M.
Lautenbach Rodney R.
Mcguire Darrel
Harnischfeger Corporation
Ridout & Maybee Llp
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