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首先介紹點焊機工作原理：點焊的工藝過程為開通冷卻水；將焊件表面清理干凈，裝配準確后，送入上、下電極之間，施加壓力，使其接觸良好；通電使兩工件接觸表面受熱，局部熔化，形成熔核；斷電后保持壓力，使熔核在壓力下冷卻凝固 形成焊點；去除壓力，取出工件。焊接電流、電極壓力、通電時間及電極工作表面尺寸等點焊工藝參數對焊接質量有重大影響。點焊機利用正負兩極在瞬間短路時產生的高溫電弧來熔化電極間的被焊材料，來達到使它們結合的目的。

市場上的各種型號的點焊機很多，價格不一。很多客戶往往不知所錯，一般都關心點焊機多少錢一臺，雖說點焊機價格是撬動市場的杠桿，但是真正讓客戶下定決心購買的不僅僅是價格。電阻焊機，還有壓力焊機，這都是點焊機，工作性質及方法基本一樣，因為可以焊接金屬薄板，及各種鋼絲和絲網，市場應用廣泛，隨著原材料價格的飛漲，個別生產廠家開始走偷工減料的路子，一般有以下幾種方式：

　　1，功率做小，空載率小，甚至有的電焊機廠家做到5-8%，這樣的機器不知道能工作多長時間。

　　2，由于點焊機的低電壓大電流的特性要求所有的導電回路，電導率必須高，不能偷工減料，但是有的電焊機廠家因為成本因素，將變壓器回路設計成銅包鋁的設計外觀根本看不出區別來，只有使用一段時間后才能發覺。

　　3還有其他一些原因造成的質量不穩定，就不一一贅述了。

雖然點焊機價格是采購的一個方面，但是性能及質量更是不能忽視的。

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.

　　點焊機操作過程中的注意事項

　　點焊機尤其是中頻點焊機的使用越來越廣泛，正因為如此，點焊機的使用就顯的尤為重要。

　　1，在使用點焊機是調好位置，電極臂保持互相平行，調節好電極桿，使電極剛好壓到焊件時。



　　2，中頻直流點焊機可以根據焊件的厚度和材質選定電流調節開關的級數。通電后電源指示燈應亮，通過調整彈簧壓力螺母，改變其壓縮程度來獲得電極壓力的大小。在完成以上工作后，可先接通冷卻水后在接通電源準備焊接。

　　3，具體的操作過程：焊件置于兩電極之間，踩下腳踏板，并使上電極與焊件接觸并加壓，在繼續壓下腳踏板時，電源觸頭開關接通，于是變壓器開始工作次級回路通電使焊件加熱。當焊接一定時間后松開腳踏板時電極上升，借彈簧的拉力先切斷電源而后恢復原狀，單點焊接過程即告結束。

　　4，點焊機焊機準備及裝配，工件焊接之前要記得清除一切臟物、油污、氧化皮及鐵銹，特別對熱軋鋼，最好把焊接處先經過酸洗、噴砂或用砂輪清除氧化皮。未經清理的焊件雖能進行點焊，但是嚴重地降低電極的使用壽命，同時降低點焊的生產效率和質量，這一點尤為重要。對于有薄鍍層的中低碳鋼可以直接施焊。