首先介绍点焊机工作原理：点焊的工艺过程为开通冷却水；将焊件表面清理干净，装配准确后，送入上、下电极之间，施加压力，使其接触良好；通电使两工件接触表面受热，局部熔化，形成熔核；断电后保持压力，使熔核在压力下冷却凝固 形成焊点；去除压力，取出工件。焊接电流、电极压力、通电时间及电极工作表面尺寸等点焊工艺参数对焊接质量有重大影响。点焊机利用正负两极在瞬间短路时产生的高温电弧来熔化电极间的被焊材料，来达到使它们结合的目的。

市场上的各种型号的点焊机很多，价格不一。很多客户往往不知所错，一般都关心点焊机多少钱一台，虽说点焊机价格是撬动市场的杠杆，但是真正让客户下定决心购买的不仅仅是价格。电阻焊机，还有压力焊机，这都是点焊机，工作性质及方法基本一样，因为可以焊接金属薄板，及各种钢丝和丝网，市场应用广泛，随着原材料价格的飞涨，个别生产厂家开始走偷工减料的路子，一般有以下几种方式：

　　1，功率做小，空载率小，甚至有的电焊机厂家做到5-8%，这样的机器不知道能工作多长时间。

　　2，由于点焊机的低电压大电流的特性要求所有的导电回路，电导率必须高，不能偷工减料，但是有的电焊机厂家因为成本因素，将变压器回路设计成铜包铝的设计外观根本看不出区别来，只有使用一段时间后才能发觉。

　　3还有其他一些原因造成的质量不稳定，就不一一赘述了。

虽然点焊机价格是采购的一个方面，但是性能及质量更是不能忽视的。

英文版：

There are many types of spot welding machines on the market, with different prices. Many customers are often unaware of their mistakes. They generally care about how much a spot welding machine is. Although the price of a spot welding machine is a lever to leverage the market, it is not just the price that really convinces customers to buy. Resistance welding machines and pressure welding machines are all spot welding machines. The working properties and methods are basically the same. Because metal sheets can be welded, and various steel wires and wire meshes, the market is widely used. With the soaring price of raw materials, individual Manufacturers begin to take the road of cutting corners, generally in the following ways:



1. The power is small and the no-load rate is small. Some welding machine manufacturers even achieve 5-8%. Such a machine does not know how long it can work.

2. Due to the low voltage and high current characteristics of the spot welding machine, all conductive circuits must be high in conductivity, and they cannot be cut corners, but some welding machine manufacturers design the transformer circuit as a copper-clad aluminum because of cost factors. There is no difference, only to find out after using it for a period of time.

3 There are other reasons for unstable quality, so I wo n’t go into details one by one.

Although the price of spot welding machines is an aspect of purchase, performance and quality cannot be ignored.



Precautions during operation of spot welding machine

Spot welding machines, especially intermediate frequency spot welding machines, are becoming more and more widely used. Because of this, the use of spot welding machines is particularly important.

1. When the spot welding machine is used, the position is adjusted, the electrode arms are kept parallel to each other, and the electrode rod is adjusted so that the electrode is just pressed to the weldment.



2. The intermediate frequency DC spot welder can select the number of current adjustment switches according to the thickness and material of the weldment. After the power is turned on, the power indicator light should be on. The electrode pressure can be obtained by adjusting the spring pressure nut and changing its compression degree. After completing the above work, you can first connect the cooling water and then turn on the power to prepare for welding.

3. The specific operation process: the weldment is placed between the two electrodes, the foot pedal is pressed, and the upper electrode is brought into contact with the weldment and pressurized. When the foot pedal is continued to be pressed, the power contact switch is turned on, and the transformer starts to work The secondary circuit is energized to heat the weldment. When the foot pedal is released after welding for a certain period of time, the electrode rises, the power of the spring is first cut off and then restored to the original state, the single-point welding process is over.

4. Spot welding machine Welding machine preparation and assembly. Before welding the workpiece, remember to remove all dirt, oil, oxide scale and rust. Especially for hot-rolled steel, it is best to clean the welding place by pickling, sandblasting or grinding Oxide. Although uncleaned weldments can be spot-welded, the service life of the electrode is severely reduced, and the production efficiency and quality of spot-welding are also reduced. This is particularly important. For medium and low carbon steel with a thin coating can be directly welded.

　　点焊机操作过程中的注意事项

　　点焊机尤其是中频点焊机的使用越来越广泛，正因为如此，点焊机的使用就显的尤为重要。

　　1，在使用点焊机是调好位置，电极臂保持互相平行，调节好电极杆，使电极刚好压到焊件时。



　　2，中频直流点焊机可以根据焊件的厚度和材质选定电流调节开关的级数。通电后电源指示灯应亮，通过调整弹簧压力螺母，改变其压缩程度来获得电极压力的大小。在完成以上工作后，可先接通冷却水后在接通电源准备焊接。

　　3，具体的操作过程：焊件置于两电极之间，踩下脚踏板，并使上电极与焊件接触并加压，在继续压下脚踏板时，电源触头开关接通，于是变压器开始工作次级回路通电使焊件加热。当焊接一定时间后松开脚踏板时电极上升，借弹簧的拉力先切断电源而后恢复原状，单点焊接过程即告结束。

　　4，点焊机焊机准备及装配，工件焊接之前要记得清除一切脏物、油污、氧化皮及铁锈，特别对热轧钢，最好把焊接处先经过酸洗、喷砂或用砂轮清除氧化皮。未经清理的焊件虽能进行点焊，但是严重地降低电极的使用寿命，同时降低点焊的生产效率和质量，这一点尤为重要。对于有薄镀层的中低碳钢可以直接施焊。