预应力焊接在高温锅炉主蒸汽阀旁路管管座焊缝裂漏中的应用
예응력한접재고온과로주증기벌방로관관좌한봉렬루중적응용
Using prestressed welding to eliminate leakage in cracked main-steam valve by-pass pipe saddles of high-temperature boilers
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