Hydraulic torque converter with welding pollution preventing stricture

The invention aims to solve the technical problem that the welding pollution is generated in a torque converter by pollution. The technical scheme used for achieving the purpose of the invention is as follows: a hydraulic torque converter with a welding pollution preventing stricture comprises a pump wheel assembly and a guide wheel assembly which are buckled together through spigots; the hydraulic torque converter is characterized in that the spigot used for buckling the pump wheel assembly with the guide wheel assembly is a convex spigot; the spigot used for buckling the guide wheel assembly with the pump wheel assembly is a concave spigot; a metal ring sleeves the convex spigot; an annular slot is formed between the metal ring and the step surface of the convex spigot. When the concave spigot of the guide wheel assembly is buckled, the metal ring is pressed by the end surface of the concave spigot; the pump wheel assembly and the guide wheel assembly are connected to be a whole body by welding.