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Author Topic: Knife Plates  (Read 1231 times)

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Offline flyingparks

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Re: Knife Plates
« Reply #20 on: April 17, 2019, 07:51:20 AM »
Clever

Offline Jim_Rogers

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Re: Knife Plates
« Reply #21 on: April 17, 2019, 09:28:50 AM »
Hey Jim was there any concern about the heat transfer from the welding surfaces to the posts?
I wasn't there when it was welded but soon afterwards and saw that the concrete was wet. I'm assuming that the welder had a bucket of water there to wet the timber to keep it from burning from the heat of the weld.
Jim Rogers
Whatever you do, have fun doing it!
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Offline flyingparks

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Re: Knife Plates
« Reply #22 on: April 17, 2019, 10:03:59 PM »
Totally agree, Brad. I always ask the engineer if we can set them after the concrete starts to set up. Sometimes they allow, sometimes they don't. Sometimes the rebar welded the bottom of the base plate needs to be 2'6". Yikes!

Offline timberwrestler

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Re: Knife Plates
« Reply #23 on: April 17, 2019, 10:45:00 PM »
Not me (my buddy), but what I'd do:








Online luap

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Re: Knife Plates
« Reply #24 on: April 18, 2019, 06:55:32 PM »
After only their second year of training most welders are certified for building structural items. That stated it may be different for housing items.

Typical of inspectors though not to accept something that is outside of their understanding of what is appropriate.
welding certification can be a very specific process. structural and pipe welding have the welding procedure certified first. That will specify type of rod,  what is used for the root pass  and how wide the cover pass is and how high above base metal it can be and base material. The welder then makes the weld in whatever position is specified. certain positions supersede others. If I certify on 8 inch pipe in a 45 deg position then I am good for pipe that size and smaller in any position. If I certify on horizontal pipe then that's what my certificate is good for. Pipe welding certificate supersedes all structural. then the testing can be x-ray or destructive. Only so many defects are allowed to pass. all that said welding inspectors are working for the company building the pipeline or bridge or whatever and will have there own set of requirements usually dictated by the engineers. No matter what certificate you may have held every welder is tested on site. You also have to make a certified weld within a certain time period to keep you certification. At one time on these bigger jobs only a percentage of welds were tested but most require every weld x-ray tested today. So just because some is certified may not tell you the complete story

Offline Don P

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Re: Knife Plates
« Reply #25 on: April 20, 2019, 06:20:13 PM »
This is a link to what luap is describing.
chapter 3 describes the procedures for prequalified welds;
https://law.resource.org/pub/us/cfr/ibr/003/aws.d1.1.2000.pdf

Edit, here is some text describing the certification for WPS's, Welding Procedure Specifications. Our building department really hasn't looked very hard at welding and steel bolting in the past, that is changing so I've been reading up and taking a certification class in hopes of being able to do basic prequalified welds in the field. In the past for instance on one job I welded up reinforcing steel cages inside of stone piers that were then welded to the knife plates The pier reinforcing steel was also welded to horizontal bars that supported the railings. This was all happening in conjunction with the stonemason's work. It is much easier for me to do it than to call in a welder repeatedly for small jobs. Right now I'm waiting on one to come weld the tops and bottoms of 4 steel posts. Much easier if I can do it. I may have to call in a special inspector which is the way the BO is leaning, that is the purpose of my reading this stuff of late. Anyway, here is what I was just reading, I had found the shortened version in a code reference which referred to this;

4.1.1.2 Previous WPS Qualification.
The engineer may accept properly documented evidence of previous
qualification of the WPSs that are to be employed. The
acceptability of qualification to other standards is the Engineer's
responsibility, to be exercised based upon the
specific structure, or service conditions, or both. AWS
B2.1.XXX-XX Series on Standard Welding Procedure
Specifications may, in this manner, be accepted for use in
this code.


4.1.2 Performance Qualification of Welding Personnel.
Welders, welding operators and tack welders to be
employed under this code, and using the shielded arc
welding (SMAW), submerged arc welding (SAW), gas
metal arc welding (GMAW), gas tungsten arc welding
(GTAW), flux cored arc welding (FCAW), electroslag
welding (ESW), or electrogas welding (EGW) processes,
shall have been qualified by the applicable tests as described
in Part C of this section. See Commentary.

4.1.2.1 Previous Performance Qualification.
Properly documented evidence of previous performance qualification
of welders, welding operators and tack welders
may be accepted with the Engineer's approval. The acceptability
of performance qualification to other standards
is the Engineer's responsibility, to be exercised
based upon the specific structure, or service conditions,
or both. Welders and welding operators qualified by standard test to
AWS B2.1, Standard for Welding Procedure and Performance Qualification,
may, in this manner, be accepted for use in this code.
A laborer works with his hands
A craftsman uses his brain and his hands
An artist uses his brain, his hands, and his heart


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