Original preheating temperature: the temperature of the workpiece in the weld zone immediately prior to any welding operation.
初始预热温度是指任何焊接操作开始之前，焊接区域内工件的瞬时温度。
The non-oxidizing zone is consisted of entry sealed room, waste gas preheating zone, direct heating zone, and furnace nozzle and flue gas exhausting system.
无氧化段由入口密封室，废气预热区，直接加热区，炉喉，废气排放系统组成。
The reasons of forming temperature difference of preheating. zone of tunnel kiln and the ways to improve it are discussed, and suggest is put.
就隧道窑预热带上下温差产生的原因及其改善措施进行了论述，并提出了建议。
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