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Aluminum windows$ door real-time quotes, last-sale prices

Argon arc welding method for aluminium pipe:(1) welding example, economizer, evaporator section, tube bundle, water wall and low temperature superheater are made of No. 20 steel, and high temperature superheater tube is 12Cr1MoV.(2) before welding, before welding, the pipe should be 30 degrees, and the inside and outside 15mm range of the pipe