| 摘要 |
PURPOSE: To extend the use period of a preventive agent and to decrease the number of recoating so as to improve efficiency in arc welding of metallic parts by specifying the compsn. of an oil agent to be coated to a welding nozzle. CONSTITUTION:30-78.9% base oil by weight, 0.1-10% wax, 1-30% boron nitride powder, and 20-30% surface-active agent are incorporated as the preventive agent to be coated to the welding nozzle. The preventive agent is diluted with water to prepare 10-60wt.% emulsion which is then coated to the nozzle. The base oil is easily flowable therein and has the effect of coating the nozzle uniformly. The wax contributes to an improvement in the heat resistance and mechanical strength of the film and has the effect of dispersing the boron nitride into the base oil. The boron nitride protects the spatters from the base oil and wax by its heat resistance. The surface-active agent has the effect of dispersing and emulsifying the mixture composed of the base oil, wax and boron nitride into water and therefore, said agent accelerates the uniform sticking of the oil agent to the nozzle surface. |
