Centrifugal fan, air-conditioning apparatus, and method of manufacturing centrifugal fan

A method of manufacturing a centrifugal fan having a main plate rotatably driven by a fan motor, a shroud facing the main plate, and a plurality of blades provided between the main plate and the shroud, the centrifugal fan being configured to suck gas in a direction of a rotation axis and blow out the gas in a direction intersecting the rotation axis, the method comprising:

• forming a projection that extends in a straight line or a curved line on an abutting surface formed on each of the plurality of blades for abutting on an abutted surface formed on at least one of the main plate and the shroud, the abutting surface has an edge and a central portion;
• placing the projection formed on the abutting surface in abutment with the abutted surface;
• and
• welding the abutting surface and the abutted surface to each other by directing a laser beam onto the projection and moving the laser beam along the projection, wherein
• each of the plurality of blades further includes
• a first member constituting at least a part of one blade surface of each of the plurality of blades, and
• a second member having a surface portion facing the first member and constituting at least a part of an other blade surface of each of the plurality of blades and a peripheral edge extending from an end of the surface portion toward an end of the first member, the second member forming a hollow space between the first member and the second member,
• the abutting surface is formed on the peripheral edge of the second member,
• the projection is formed closer to the surface portion of the second member than the central portion of the abutting surface in a direction of extension of the peripheral edge of the second member, and
• the projection is formed apart from both the edge of the abutting surface and the central portion of the abutting surface in the direction of extension of the peripheral edge of the second member.