A container for foodstuffs including a carton and pad, each formed from a cut and creased blank of foldable sheet material. The method includes the steps of: providing a drill string having a central fluid passage extending along a longitudinal axis of the drill string for passing drilling fluid to the drill bit. A first phase detector compares the phases of the reference clock and the delayed rising clock to output a first detection signal corresponding to the compared phases. The first drive shaft and the second drive shaft are pivotably arranged such that the first drive shaft and the second drive shaft are configured to transition between a first, substantially straight arrangement and a second, substantially perpendicular arrangement. Steel plate held by a number of jaws urged by springs can reduce inner stress or friction happened between the steel plates; in addition, a gas cutting, machine for trimming off the butt ends, trimmed leading and trailing edges facilitate welding more promptly and efficiently.