|
7/1/2007
To my knowledge, we consider the weld seam to have the same resistance as the rest of the material but that is probably not completely true. There are some papers that have looked at fatigue or the notch-toughness of hollow structural sections, such as this one:
Notch Toughness of Internationally Produced Hollow Structural Sections
J. Struct. Engrg., Volume 131, No. 2, pp. 279-286 (February 2005)
N. Kosteski, J. A. Packer, F.ASCE; and R. S. Puthli
I’ve asked one of the authors to comment! Jeff Packer of the University of Toronto confirms that the weld seam in hot-finished (hot-formed) HSS can be assumed to have the same mechanical properties as the material in the rest of the HSS. The weld seam in cold-formed HSS has not been found to have lower static or fatigue resistance.
However, there is a trend to develop a next-generation manufacturing specification for HSS that would contain more stringent or additional requirements than the present ASTM A500 or CSA G40.20/21 standards. They would include upper limits on Fy and Fy/Fu ratios, a Charpy toughness rating, larger corner radii, making it more apt for applications in which dynamic loads govern. Such a movement is not so dissimilar to what has happened to the W shapes, with the ASTM A992 being more stringent and better suited for high-performance dynamically loaded structures than the older ASTM A572 standard steels.
This question appeared in the "Ask Dr. Sylvie" column of Advantage Steel no. 29, Summer 2007.
|  |
Have we responded to your question? If you need more details, please don't
hesitate to contact
our experts.
Questions
in this category
Back
to the FAQ
|