Welding

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From: Marvin Kaye <marvkaye [at] olsusa.com>
Subject: Welding
Date: Tue, 15 Sep 1998 21:56:13 -0400
To: <lancair.list [at] olsusa.com>

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Any welders out there?  I'm curious about the proper method to use when

welding together an assembly like an engine mount.  When looking at the

completed O-360 dynafocal mount supplied by the factory, it looks like all

of the parts were setup in the fixtures and all of the welds were then

completed en-masse at each junction.  I'm wondering if it's acceptable to

weld up subassemblies, then weld the fixtured parts to the welds that exist

on the subassemblies separately?



Case in point... if you look at the firewall mounting pads on the engine

mount they are each constructed from a steel washer with a piece of

thick-wall tube (which accepts the mounting bolt) welded to it along with

all the trusswork.  If all of the components were welded at the same time,

the areas on that little mounting pad which are covered by the ID of the

trusswork tubing would not have any welds.  I am thinking about welding up

the mounting pads first, then fitting the trusswork in and welding to the

pad and its welds... make sense?  Which way is right... which way is

stronger... what is the accepted practice?



  <Marv>