一般焊接会出现什么问题（焊接时有哪些常见问题）

• 什么是焊接电源？

1. What is welding power supply?

答：焊接电源是指在电焊机中，具有适合焊接的电气特性的设备，并提供焊接所需电能，称为焊接电源。

Welding power supply refers to the equipment with electrical characteristics suitable for welding in the electric welding machine and provides the electric energy required for welding, which is called welding power supply.

• 当电弧长变化时，电弧电压也会变化？

2. When the arc length changes, the arc voltage will also change?

答：是由弧焊电源的外部特性决定的，电弧越长，电弧电压越高。电弧越短，电弧电压越低。

Answer: it is determined by the external characteristics of the arc welding power source. The longer the arc, the higher the arc voltage. The shorter the arc, the lower the arc voltage.

• 在CO2焊接当焊丝伸出长度发生变化，电流显示值会变化吗？

3. In CO2 welding, when the extension length of welding wire changes, will the current display value change?

答：焊丝延伸长度越长，焊丝电阻越大，电流热消耗越大，显示焊接电流值越小，焊接电流实际越小。因此，焊丝的伸长度一般设定在12-20毫米的范围内。

Answer: the longer the extension length of the welding wire, the greater the resistance of the welding wire and the greater the current heat consumption. The smaller the welding current value, the smaller the actual welding current. Therefore, the elongation of the welding wire is generally set in the range of 12-20 mm.

• 电弧挺度是什么？

4. What is the arc stiffness?

答：在磁收缩和热收缩的作用下，电弧沿电极轴向的挺直程度就是电弧挺度。

under the action of magnetic contraction and thermal contraction, the straightness of the arc along the axial direction of the electrode is the arc stiffness.

• 有哪些焊接会出现电弧偏吹？

5. What kind of welding will have arc bias blowing?

答：焊接时由于磁场的作用、气流的干扰或被焊条偏心的影响，电弧中心偏离电极轴线。

Answer: during welding, the arc center deviates from the electrode axis due to the action of magnetic field, the interference of air flow or the influence of electrode eccentricity.

• 正接法是什么？

6. What is the direct connection method?

答：在直流电弧焊中，焊机与焊件输出端的正极相连，输出端与焊枪的负极相连。这种连接方式叫“正接法”，也叫正极性。

Answer: in DC arc welding, the welding machine is connected with the positive pole of the output end of the weldment, and the output end is connected with the negative pole of the welding gun. This connection is called "positive connection", also known as positive polarity.

• 电弧点焊是什么？

7. What is arc spot welding?

答：薄板搭接接头，采取MIG/MAG/TIG/CO2焊接方法，在一定时间内，以焊接电流形成表面熔核，连接上下板。

Answer: the lap joint of thin plate adopts MIG / MAG / TIG / CO2 welding method. Within a certain time, the surface nugget is formed with welding current to connect the upper and lower plates.

• 滞后停气时间是什么？

8. What is the lag time?

答：即焊接电弧熄灭后，延迟保护气体0.3-5秒后停止供气。

Answer: after the welding arc is extinguished, stop the gas supply after delaying the shielding gas for 0.3-5 seconds.