The good parameter combination of upset length upset speed and upset force and making the alternation crystal and deformed crystal in the weld metal sufficiently is the insurance of welding quality .

匹配好顶锻力、 顶 锻 速度、顶锻量等参数，促使焊口金属充分进行交互结晶和形变再结晶，可获得优质的焊接接头。

He was badly bruised by the upset of his sled at a high speed .

他因 速度很快被雪橇的 翻转严重擦伤。

The influence of upset length speed and current time on the weld quality is investigated .

探索了在相同加热条件下，钢轨钢在 顶 锻 变形过程中的 顶 锻量、 顶 锻 速度以及带电 顶 锻时间对接头焊接质量的影响规律。

The result obtained as : The upset force increase with the increasing of upset length and upset speed and with the reducing of heating temperature .

结果表明：钢轨焊接所需项锻力随顶锻量、 顶 锻 速度的增加而增大，随焊口温度的降低而升高。