Through experiment from reason and practice, the influence of the preheating method on eliminating crack of pinch roller in the surfacing welding was discussed .
本文经过实验，从实践和理论上，研究了预热方法对消除夹送辊堆焊冷裂纹和热裂纹的影响。
Then current through C1, RT forms the return circuit-preheating filament.
于是，电流通过C1、Rt形成回路预热灯丝。
Then current through C1, RT forms the return circuit-preheating filament.
于是，电流通过C1、Rt形成回路预热灯丝。
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