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RE: Investigating Welds

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Can anyone recommend a Lab I can contact that services Riverside County
(East Valley Desert areas - Palm Springs)?

Thanks
Dennis

> -----Original Message-----
> From: Christopher Wright [mailto:chrisw(--nospam--at)skypoint.com]
> Sent: Wednesday, April 18, 2001 3:48 PM
> To: ?
> Subject: Re: Investigating Welds
>
>
> >What is the standard I should follow to evaluate the welded
> connections that
> >support the 50-kip counterweights? What percentage of welds should be
> >checked? Should they be X-rayed, magnafluxed.....?
> Bill's right--the standard is AWS 1.1, but there's more to it. You need
> to start with the AISC spec for structural welds for sizing and basic
> design issues. You'll also need to set up a means to insure you have
> qualified welders and weld procedures. Most of the QA problems I've run
> into started with welds specified and supervised by people who know
> nothing about welding and weld quality.
>
> Sticking my neck out a little, you'll probably be dealing with fillet
> welds performed in the field. If it were me I'd restrict testing to
> either liquid penetrant or magneting particle testing of a representative
> sample (5-10%)of critical welds. Tests like these are practical, and my
> experience has been that NDT has a hidden benefit--welders really don't
> like repairing welds and they tend to work more carefully if they think
> subsequent examination means grinding out defects and reworking a weld.
>
> Your service sounds very much like critical lifting: highly cyclic and
> service load dominated. Weld defects, especially cracks that grow
> quickly. kill people in such circumstances, so quality is very important.
> You probably won't be doing any impact testing, but you should be using
> weld metal with minimum impact test properties. The work goes a little
> slower, but I doubt if it'll make any real difference in this case. Your
> clients will be laity who work under pressure on a budget and don't care
> jack about engineering so be very careful about someone's brother-in-law
> who works cheap.
>
> Christopher Wright P.E.    |"They couldn't hit an elephant from
> chrisw(--nospam--at)skypoint.com        | this distance"   (last words of Gen.
> ___________________________| John Sedgwick, Spotsylvania 1864)
> http://www.skypoint.com/~chrisw
>
>
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