An undesirable coil condition in which the material appears dished. It can be caused in the cold rolling process if too much pressure is placed on the center of the strip, overstretching and lengthening the center of the material. If the material is rolled, the bumps simply transfer to the other side or pop in and out like an oil can.
The Fabricator Blog
Scholarship fund to honor Dick Kallage - by Tim Heston FMA’s Nuts, Bolts, & Thingamajigs foundation has set up a memorial scholarship fund in honor of Dick Kallage, an influential member of FMA and columnist for The FABRICATOR magazine. Kallage died of cancer Feb. 18.
The only North American publication devoted to the metal tube and pipe industry industry and is a trusted source of information for professionals. Subscriptions are free to qualified tube and pipe professionals in North America.
TheFabricator.com provides metal fabrication professionals with market news, the industry's best articles, product news, and conference information from the Fabricators & Manufacturers Association, Intl.