The invention discloses a
welding method for
welding a vent
pipe on an oil filling
pipe, which comprises the following steps: selecting a
metal welding ring to be sheathed on the periphery of the weld of the vent
pipe; placing the oil filling pipe on a stand fixture of a high-frequency welding
machine; arranging the vent pipe into a connecting hole of the oil filling pipe, leading the connecting part of the vent pipe and the oil filling pipe to be vertical to the connecting hole; fixing the vent pipe, and leading the
metal welding ring to be covered above the connecting hole; circling a high-frequency welding head of the high-frequency welding
machine on the periphery of the vent pie and leading the high-frequency welding head to correspond to the welding part of the oil filling pipe and the vent pipe, and simultaneously positioning the
metal welding ring at a heating part; starting the high-frequency welding
machine, melting the metal welding ring and leading the
molten metal welding ring to permeate into a
weld seam till completely filling the
weld seam; and taking out the oil filling pipe and the vent pipe and finishing welding. Compared with the prior art, the welding method has the advantages of simple operation, welding material conservation, smooth welding surface, high welding quality, good welding strength, better sealing property, low welding temperature, safety and the like.