焊接接头形式有对接接头、T字接头、角接接头和搭接接头四种。焊接工件接头的对缝尺寸是由焊件的接头形式、焊件厚度和坡口形式决定的。电工自行操作的焊接通常是角钢和扁钢，一般不开坡口，对缝尺寸是0~2mm。
对于较厚的焊件，应进行频率自动控制。
For welding thicker pieces, automatic frequency control should be adopted.
它将检测焊缝位置的传感器与检测焊件高度的传感器合为一体。
It combines the sensor detecting positions of seams with the sensor detecting height of welded parts.
试验结果表明焊件的疲劳寿命可以通过打磨焊缝得到改善，尤其对于高强度钢焊件。
The experimental results show that the fatigue life of steel welded joints can be improved by grinding the weld bead, especially for the higher strength steel.
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