本文用切条法测定焊接方管截面的残余应力，并对其数据进行了统计分析。
Residual - stress in welded square tube is measured by the sectioning method. And the statistical analysis of its data is made.
冷中子孔道方管采用铝合金材料焊接而成，其作用是从冷中子源引出中子。
Square tube in cold neutron channel is welded together by aluminum alloy plate, it is used to guide neutron from cold neutron source.
为改变这一现状，国家提出国内焊管行业开发集装箱用方矩形高频焊接钢管的计划。
In order to change the situation a plan to develop square H. F. welded pipe used in container has been put forward.
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