13 Cr oil well-pipe test material object preparation method

The invention relates to a welding method for the collet between the 35CrMo or 30CrMo and the oil drilling vitta, bushing made by the 13Cr martensitic stain less steel. The two ends of the oil drilling vitta are machined to welding groove and many uniformly plug welding holes are machined at the position of 100mm far from the welding groove; two of tested collets are welded into the groove, which is welded with the test pipe, the inner and out of the other end are machined with screw thread to connect with the test equipment; the plug welding root is welded with the collet and the side is connected with the test pipe; or it and/or pipes are set with a ring of reinforced tendon, which the material is the low alloy high strength steel and welded with the collet and test pipe by the angle welding line. In the condition of high temperature, pressure and loading, the joint head is welded well, so it solves the problem of connecting between the 13Cr pipe and collet and has high reliability and successful ration, low period to improve the working efficiency and decrease the cost comparing to the screw + glue sealing structure.