The mechanical properties and metallographic structures of the friction welded drill rod and the hot upset forged drill rod pipe are compared.

本文叙述了这种钻杆的焊接性，并与采用热镦粗工艺生产的钻杆管体金相组织和机械性能进行了对比。

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Gonzalez was cheered on by his own band of raucous fans in the day's final match on Rod Laver Arena, and they were sensing a minor upset when the Chilean hit a hot streak to take a two sets to one lead.

BBC: Juan Martin del Potro out of Australian Open