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Re: [PSUBS-MAILIST] end caps [was: what is the diference k250- k600]

Hi,  We own a welding business and  work on high pressure piping & vessels so my outlook on highly stressed welds is different than most. Also, it's a constant struggle against welding misconceptions, myths & old wives tales. I agree that placing welds in an area of less stress is a good practice, especially when the welds are made by an amatuer.   JTMcC. 
----- Original Message -----
From: AndrePevestorf@aol.com
To: personal_submersibles@psubs.org
Sent: Wednesday, May 15, 2002 10:17 AM
Subject: Re: [PSUBS-MAILIST] end caps [was: what is the diference k250- k600]

Hi folks,
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"avoid having any welds in the weakest/most stressed area" A properly made
weld on high pressure pipe or a pressure vessel will always beat the pipe,
that is the weld and the heat affected zone will be stronger than the parent
material.   JTMcC.
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The problem are not the weld as it is, but the internal stress inside the structure due to the thermal influence by the welding process. ("Schweißeigenspannungen" in German)

If you are able to minimize this remaining stresses (by re-heating or hamering) ... then you have only to concider the influence of the weld seam geometrie and the influence of the harder material in the welding zone ("geometrische und material Kerbwirkung")

never the less it is possible to handle the problems with welding in high stressed zones but the best way to solve a problem is to avoid the problem, ist´nt it?

A.