Aluminium when to consider the HAZ effect in a truss frame ?
Aluminium when to consider the HAZ effect in a truss frame ?
(OP)
Hi,
I have a verification to do on a traffic light truss (span of 90feet) The truss is made of 6061-T6.
What will be the value of the Fy for the calculation? Will you use a value of 35 ksi or will you consider it welded and reduce it to 15 ksi ?
I have a verification to do on a traffic light truss (span of 90feet) The truss is made of 6061-T6.
What will be the value of the Fy for the calculation? Will you use a value of 35 ksi or will you consider it welded and reduce it to 15 ksi ?






RE: Aluminium when to consider the HAZ effect in a truss frame ?
RE: Aluminium when to consider the HAZ effect in a truss frame ?
That means a single pass weld on thin plate that cools rather rapidly will not experience the same degratation of mechanical properties as a thicker plate that is welded with multiple passes with no attempt to control interpass temperature.
The values published by AWS D1.2 for UTS and YS, in the as welded condition, are for situations where the procedure is qualified by testing and the manufacturer does everything correctly.
It can be challanging to attain the required values even when the manufacturer/fabricator is expereienced with aluminum alloys.
The HAZ can extend a considerable distance from the toe of the weld depending on the material thickness and the interpass temperature. The HAZ is overaged, allowing the alloying elements to precipitate to the grain boundaries, thereby weaking the base metal in those areas.
Best regards - Al
RE: Aluminium when to consider the HAZ effect in a truss frame ?
thx for the help, but still I'm not sure about my verifcation, should I consider the HAZ ?
RE: Aluminium when to consider the HAZ effect in a truss frame ?
http://www.FerrellEngineering.com
RE: Aluminium when to consider the HAZ effect in a truss frame ?
In testing I've done, the welding reduction is very conservative; however, the properties in the HAZ are highly variable, thus the overall reduction in allowables.