关于苏联专家巴拉巴同志建议利用无缝钢管制造岩心管钻杆接头（如图1所示）的优点已在探矿工程第一期介绍过了。兹根据一年来制造过程中工艺的初步经验介绍如下，供在锻制该项产品时作为参考。 With regard to Soviet Union expert Barabbas suggests that the advantages of using a seamless steel tube to manufacture a core pipe drill joint (Figure 1) have been introduced in the first phase of the exploration project. Based on the first year of the manufacturing process of the initial experience is introduced below, for forging the product as a reference.