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RE: TWL: Electrical trouble shooting

JM
james.m.bohn@boeing.com
Mon, Apr 1, 2002 3:54 PM

Arild Jensen (elnav@uniserve.com) wrote:

Soldering can cause damage to insulation and if it wicks beyond the barrel
will create a hard
point which will fail if there is any vibration or repeated flexing.
This is why mil spec connectors now requires crimping instead of

soldering. > They learned the

hard way that soldered connections eventually have a nearly 100% failure
rate.

Agree completely.  I can tell you that on a military aircraft, the only
place you will find solder is where the joint is completely restrained from
movement, such as a wave-soldered printed circuit card.  Corrosion in a dry
joint may be evil, but fatigue cracks in solder joints are more so.

Jim Bohn
M/V Margaret Ann
1974 Trojan 44

>Arild Jensen (elnav@uniserve.com) wrote: > > Soldering can cause damage to insulation and if it wicks beyond the barrel > will create a hard > point which will fail if there is any vibration or repeated flexing. > This is why mil spec connectors now requires crimping instead of soldering. > They learned the > hard way that soldered connections eventually have a nearly 100% failure > rate. Agree completely. I can tell you that on a military aircraft, the only place you will find solder is where the joint is completely restrained from movement, such as a wave-soldered printed circuit card. Corrosion in a dry joint may be evil, but fatigue cracks in solder joints are more so. Jim Bohn M/V Margaret Ann 1974 Trojan 44