What is PQR?PQR for welding of pipe spools - pipingfab

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What is PQR?PQR for welding of pipe spools

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Hebei Haihao Group was established in 1982, located in Mengcun County—the hometown of pipe fittings in China. We are the first and one of the biggest companies which can produce pipe fittings,flanges and steel pipes. Our Group owns subsidiaries, there are more than 600 employers, including 85 technologists. The Group covers 850,000 square meters and owns fixed assets RMB 300,000,000 .

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