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heat pump heat exchanger class

2013年9月5日 阅读:473

Titanium pipe welding materials Wire; wire grades as ERTi 2, select wire should meet the following requirements: ( L ) welding wire in chemical composition and mechanical properties should be associated with the parent material quite; (2) if the weldment requires higher plasticity, should adopt the purity than the parent material of high wire. Argon: industrial grade pure argon, purity of not less than 99.98%, moisture less than 50Mg / m3. Argon to check before using the bottle factory certification, to verify the argon purity index, then check valve has no leakage or malfunction of the first elephant. Titanium pipe welding process is in the atmosphere using manual tungsten inert gas welding ( GTAW ) welding method, welding of titanium tube groove and on both sides of the25mm within the inside and outside surface to remove grease, application of austenitic stainless steel wire brush, and other mechanical method of removal of the reamer, burr and oxide film surface defect. Cleaning tools should be designed, and kept clean; the mechanical cleaning groove surface and a welding wire, welding should be used without sulphur acetone or ethanol degreasing treatment. During the welding process, using a special protective measures, so that the titanium pipe welding temperature may exceed400 C part of the partial or total in argon effective protection, to achieve the purpose of titanium pipe welding. Construction preparation, material acceptance, marking inspection, cutting and groove to groove surrounding processing and welding, welding seam appearance on P T, RT inspection weld flaw, prefabricated pipe section water pressure test, drainage, drying and orifice closed transportation and field assembly.

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