求翻译：摘 要：本文介绍在既有线铁路无缝线路的铺设和钢轨断轨修复、应力放散等维修作业中，采用铝热焊焊接过程中存在的质量问题，并通过对焊接中存在问题的分析，提出焊接前检查焊接设备及机具、申请封锁方案要考虑周全；焊接中对齐两钢轨端面、预留焊缝间隙要适当、封箱工作要精细、焊头表面打磨要适当、控制好预热温度和时间、低温下钢轨预加热、焊后热处理及焊后探伤检测等一系列的焊接前、焊接中和焊后的质量控制措施。实践证明：焊接中，只有将每一道工序按标准、按要求加以控制，一丝不苟地做好，并不断改进工艺，就能保证焊接质量达到规定的标准。是什么意思？

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Abstract: This article introduced breaks the axle repair, the stress in already wired railroad seamless line laying down with the

Summary: this describes in both line railway seamless line of laying and rail broken rail repair, and stress relief, maintenance job in the, used aluminum hot welding welding process in the exists of quality problem, and by on welding in the exists problem of analysis, made welding Qian check weldin