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Special steel structure
High frequency welding
High-rise steel structure
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AWS Welder—Bo Liu
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AWS Welder—Guwen Liu
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AWS Welder—Qunjie Liu
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AWS Welder—Wei Liu
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AWS Welder—Xisong Liu
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AWS Welder—Xueyuan Liu
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AWS Welder—Zheng Liu
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AWS Welder—Nengfa Liu
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AWS Welder—Debao Luo
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AWS Welder—Yidong Lv
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AWS Welder—Guifa Shi
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AWS Welder—Guohua Shi
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