| 摘要 |
PURPOSE:To provide a titled economical welding gun which prevents thoroughly current leakage, corrosion, electrolytic corrosion, etc. owing to the water intruded therein irrespectively of welding positions under water by incorporating a mechanism for operating a chuck for clamping a stud into a corrosion preventing and insulating liquid and providing pressure resistance thereto. CONSTITUTION:A heat resistant and elastic liquid sealing member 12 is pressed to a base metal W so that the stud S fitted to the chuck 9 is brought into press contact with the base metal W against a spring 4. A solenoid 18 is actuated to fix a piston 3 by a shoe 20 when the gun is started by a trigger 28 and a switch 29. Electricity is conducted at the same time between the stud S and the base metal W and the recess 14 in an arc shield 15 is filled by an inert gas generating agent G at the top end of the stud S, by which arc melting is executed. The conduction of electricity and solenoid operation are turned off when a lever 28 is released. The stud S is then pressed by the spring 4 to the base metal and is thus welded to the base metal. The mechanism for pressing the stud S is provided within the insulating oil in a cylinder chamber 2 and a solenoid chamber 19, by which the intrusion of the water therein is thoroughly prevented and safety is assured. The underwater use of even the welding gun for land use is made possible by such construction and the extreme economy is obtd.
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