管端镦粗处理 Pipe End Upsetting Treatment
        钻杆管端加厚采用了目前国内外先进的加厚工艺控制，加厚模具的独特设计，使得钻杆加厚过渡带长，过渡平滑，减少了应力集中，有效地提高了管体使用寿命。
        Advanced upsetting technology is adopted in pipe end upsetting process. The special design of upsetting mold makes the upsetting transition zone of drill pipe much longer and smoother, as a result, the degree of stress concentration is reduced and pipe’s service life is increased.