Equivalent heat treatment method for transfer pipe of upper box of efficient composite air cooler

The invention discloses an efficient composite type air cooler upper box adapter pipe equivalent heat treatment method which comprises the following steps: preheating before welding: after an upper box outer adapter pipe is assembled and spot-welded according to drawing requirements, baking and preheating the interior of a weld bead groove and the range which is 30mm away from the edge of the groove by flame; manual argon tungsten-arc welding is adopted for welding, a welding wire with the diameter being 2.5 mm is selected for welding, and small standard parameters are selected for welding current and voltage as far as possible; filling and welding; baking after welding; and wrapping and slowly cooling with heat-insulating cotton. According to the equivalent heat treatment method for the upper box adapter of the efficient composite air cooler, equivalent treatment modes of preheating before welding, backing welding, filling welding, baking after welding and heat preservation cotton wrapping and slow cooling a