[TheForge] broken weld on mower deck

[Bruce .]

Jerry,
Was that ONE fish plate over the entire crack, or one over each drilled
hole, or what?

Bruce
NJ

On Tue, Jun 6, 2017 at 8:48 PM, terry l. ridder <terrylr at blauedonau.com>
wrote:

> hello
> ​<snip>
>
> my paraphrase.
>
> drill a stop hole at the end of the weld.
> pull the broken weld together with gentle force.
> clean up the broken weld and remove any paint in the area.
> weld the broken weld.
> take a similar metal and weld diamond shaped pieces over the repair
> weld.
> clean up welds.
> spray paint with kubota orange.
>
> repeat as necessary ;-)
>
> On Tue, 6 Jun 2017, jerry Frost wrote:
>
> 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
>>
>>
> --
> terry l. ridder ><>
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