[TheForge] broken weld on mower deck

[jerry Frost]

No, don't try heat treating the welds. First thing to do is drill stopper
holes at the ends of the cracks. After you weld it up, fish plate them it. A
fish plate is a diamond shape piece of steel of the same or similar
thickness as the piece being welded. 

NO! Do NOT use thicker steel it will defeat the purpose of fishplating. You
want the fish plate to flex and spread the force over a distance. Slightly
lighter weight steel is more effective. Fish plates are NOT reinforcements
they distribute stress, two entirely different things, related but
different.

Fish plate the high stress or high flex zone. You lay the plate over the
weld so none of the corners of the diamond line up with or fall on the weld.
Perimeter weld it over the weld. Mig it is good, the smoother the beads the
lower the stress at the edges. Do NOT torch weld, the HAZ (Heat Affect Zone)
is way too large. 

What a fish plate does is distribute the stress formed by the ends of a weld
bead which is a stress riser. A final touch to maximize the effect is to run
the beads towards each narrow end of the plate and carry the bead past the
point in a J shaped finish. Called a "J tail."

The "J tail" distributes any flexing stress over a distance in a curve
leaving no stress riser.

I hope this is clearer than it sounds. 

Frosty

-----Original Message-----
From: theforge-bounces at mailman.qth.net
[mailto:theforge-bounces at mailman.qth.net] On Behalf Of terry l. ridder
Sent: Tuesday, June 6, 2017 9:38 AM
To: theforge e-mail list
Subject: [TheForge] broken weld on mower deck

hgello

the left front scalp wheel on a kubota mower deck has broken the welds.
i have upload two photographs of the broken welds at:
birnbaum.blauedonau.com/terrylr

birnbaum, my new linux laptop.

my concern is that when i bring the parts back together the remaining weld
is going to break. Should I heat the parts to make them a little more
amenable to moving back into place?
I do not have a stick welder so I need to use either the mig welder or the
oxy-act torch. I would rather use the mig welder.

any suggestions, hints, welcomed.


--
terry l. ridder ><>
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