Metal flow takes place within the plastic range of the metal, so that the bend retains a permanent set after removal of the applied stress.

金属的流动发生在金属的塑性变形范围之内，因此在施加的外力去除之后弯曲保持永久的变形。

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If the sheet is relatively thin, the range of welding parameters obtained that can get better weld quality is wider. Heavily plastic flow of the weld metal occurs inside the weld during the process.

板材厚度较小时，形成良好焊缝的规范参数范围较宽，焊接过程中接头内部发生了剧烈的塑性流动。

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