Friction Stir Welding and Heat Treatment Process Analysis of Drilling Rod and Joint
Friction stir welding is a new solid state welding process which is first proposed by the professor of the Manufacturing Engineering Department at the University of Plymouth in 1991. This process is mainly used for joining thick plate materials without the need for flux or filler materials. Compared with other welding processes, friction stir welding has many advantages such as good weld quality, higher productivity and high welding performance. It is widely used in the field of drilling rod body and joint welding.
Drilling rod body and joint are mainly used in the drilling industry. Its weld joint of high temperature, high load bearing and high corrosion resistance must be ensured. In order to realize the welding process of drilling rod body and joint friction stir welding, the preparation of welding materials must be carefully considered and the follow-up heat treatment process must be considered.
In order to ensure the good quality of the welding of the drilling rod body and joint in the process of friction stir welding, the welding parameters of the welding process must be matched. The main parameters are process speed, feed rate, welding angle, tilt angle, tool pressure, etc. It is important to ensure the stability of these parameters during the welding process and to control the welding temperature.
In order to improve the quality of welding of the drilling rod body and joint in the process of friction stir welding, it is necessary to carry out the subsequent heat treatment of the welding joint. In general, it is necessary to carry on the initial stage of the heat treatment is the solution heat treatment, which is mainly to heat up to the certain temperature and maintain for some time, and then cooled for some hours. In order to reduce the residual stress of the welding joint, it is necessary to carry out the tempering treatment after the solution treatment, that is, heating and cooling again to a suitable temperature, so that the welding joint can be strong and uniform.
In order to guarantee the welding quality of the drilling rod body and joint, it is necessary to analyze the welding temperature and residual stress of the welding joint. Before the heat treatment of the frictional stirring welding, it is necessary to accurately detect and analyze the welding temperature and residual stress of the welding joint. By analyzing the welding temperature and residual stress, it is possible to determine the welding parameters, which can better reduce the welding residual stress and avoid the cold crack of the welding joint.
In summary, the welding of the drilling rod body and joint by friction stir welding and the subsequent heat treatment are very important steps in the whole welding process. In order to ensure the welding performance of the welding joint, it is necessary to carefully consider the material selection, welding parameters and heat treatment process of the welding joint, so as to assure the welding performance of the welding joint and reduce the possibility of cold crack damage.
