高頻焊發(fā)明于上世紀(jì)50 年代初，并迅速應(yīng)用于工業(yè)生產(chǎn)，它是利用10～500kHz 高頻電流經(jīng)焊件連接面產(chǎn)生電阻熱，并在施加或不施加壓力的情況下，實(shí)現(xiàn)原子間結(jié)合的焊接方法，目前，高頻焊接主要用于機(jī)械化或自動(dòng)化程度較高的管材和型材生產(chǎn)線，焊接件可由鋼或有色金屬制成，管徑范圍為6～1420mm、壁厚為0. 15～20mm，小徑管多采用直焊縫，大徑管多采用螺旋焊縫，近年來，作為連接的方法之一高頻焊接工藝引起人們的重視，成為連接領(lǐng)域新的研究熱點(diǎn)，正在迅速發(fā)展。

High frequency welding was invented in the early 1950s and has been rapidly applied in industrial production. It uses 10 ~ 500KHz At present, high frequency welding is mainly used in pipe and profile production lines with high degree of mechanization or automation. Weldments can be made of steel or non-ferrous metals, with pipe diameter ranging from 6 to 1420 mm and wall thickness of 0 In recent years, as one of the connection methods, high frequency welding technology has attracted people's attention and become a new research hotspot in the field of connection.

Definition of high frequency welding

高頻焊是以固體電阻熱為能源，在焊接過程中，工件高頻電流產(chǎn)生的電阻熱將工件焊接區(qū)的表層加熱到熔融或接近塑性的狀態(tài)，然后施加（或不施加）頂鍛力而實(shí)現(xiàn)金屬的結(jié)合，因此它是一種固相電阻焊方法，高頻焊接按高頻電流在工件產(chǎn)生熱的方式可分為接觸高頻焊和感應(yīng)高頻焊，接觸高頻焊時(shí)，高頻電流通過與工件機(jī)械接觸而傳入工件，感應(yīng)高頻焊時(shí)，高頻電流通過工件外部感應(yīng)線圈的耦合作用在工件內(nèi)產(chǎn)生感應(yīng)電流，高頻焊是一種高度專業(yè)化的焊接方法，應(yīng)根據(jù)產(chǎn)品配備專用設(shè)備，生產(chǎn)率高，焊接速度達(dá)30米/分鐘，主要用于制造管子時(shí)縱縫或螺旋縫的焊接。

High frequency welding uses solid resistance heat as energy. In the welding process, the resistance heat generated by high-frequency current of workpiece heats the surface layer of welding area of workpiece to molten or nearly plastic state, and then applies (or does not apply) forging force to realize metal combination. Therefore, it is a solid phase resistance welding method. High frequency welding can be divided into contact high-frequency welding according to the way of heat generated by high-frequency current in workpiece High frequency welding and induction high-frequency welding. In contact high-frequency welding, the high-frequency current is transmitted to the workpiece through mechanical contact with the workpiece. In induction high-frequency welding, the high-frequency current is generated in the workpiece through the coupling effect of the external induction coil of the workpiece. High frequency welding is a highly specialized welding method, which should be equipped with special equipment according to the product, with high productivity and welding speed of 30 m / min, It is mainly used for welding longitudinal seam or spiral seam in pipe manufacturing.

Principle of high frequency welding

高頻焊接原理——通過高頻電流的集膚效應(yīng)將高頻電能集中在焊件的表層，并通過鄰近效應(yīng)控制高頻電流流動(dòng)路線的位置和范圍，當(dāng)要求高頻電流集中在焊件的某一部分時(shí)，只要將導(dǎo)體與焊件構(gòu)成電流回路并使導(dǎo)體靠近焊件上的這一部位，使它們相互之間構(gòu)成鄰近導(dǎo)體，就能實(shí)現(xiàn)這個(gè)要求，根據(jù)焊件結(jié)構(gòu)的具體形式和要求，高頻焊接主要利用集膚效應(yīng)和鄰近效應(yīng)，使被焊件的表面金屬迅速受熱，實(shí)現(xiàn)焊接。

High frequency welding principle: high frequency electric energy is concentrated on the surface of the weldment through the skin effect of high frequency current, and the position and range of high frequency current flow path are controlled through proximity effect. When high frequency current is required to be concentrated on a certain part of the weldment, as long as the conductor and the weldment form a current loop and make the conductor close to this part of the weldment, so that they form proximity to each other According to the specific form and requirements of the weldment structure, high frequency welding mainly uses skin effect and proximity effect to make the surface metal of the weldment heated rapidly and realize welding.

高頻焊的高頻電流的兩大效應(yīng)的內(nèi)容為：集膚效應(yīng)——當(dāng)導(dǎo)體通以交流電流時(shí)，導(dǎo)體斷面上的電流分布不均勻，電流密度從導(dǎo)體中心向表面逐漸增大，大部分電流只沿導(dǎo)體表面流動(dòng)的物理現(xiàn)象，電阻率越低，磁導(dǎo)率越高，電流的頻率越高，其集膚效應(yīng)越顯著，鄰近效應(yīng)——是一種物理現(xiàn)象，當(dāng)高頻電流在兩個(gè)導(dǎo)體或往復(fù)導(dǎo)體中以相反的方向流動(dòng)時(shí)，電流將集中在導(dǎo)體的相鄰側(cè)，高頻焊接常用的電流頻率范圍為300 ~ 450 kHz，有時(shí)也使用低至10kHz的頻率。

The two main effects of high-frequency current in high-frequency welding are skin effect: when the conductor is supplied with AC current, the current distribution on the conductor section is uneven, the current density gradually increases from the center of the conductor to the surface, and most of the current only flows along the surface of the conductor. The lower the resistivity is, the higher the permeability is, and the higher the current frequency is, the more significant the skin effect is Effect is a physical phenomenon. When high frequency current flows in opposite directions in two conductors or reciprocating conductors, the current will concentrate on the adjacent side of the conductor. The frequency range of high frequency welding current is 300 ~ 450 kHz, sometimes as low as 10 kHz.

Characteristics of high frequency welding:

由于電流高度集中在焊接區(qū)，加熱速度很快，焊接速度可達(dá)150 ~ 200米/分鐘，由于焊接速度快，焊件自冷作用強(qiáng)，熱影響區(qū)不但小，而且不易發(fā)生氧化，因此焊縫的組織和性能很好，焊前焊件表面可以不進(jìn)行清理工作，因而增加了效率，可以焊接的金屬種類很多，產(chǎn)品的形狀和規(guī)格也很多。

Because the current is highly concentrated in the welding area, the heating speed is very fast, and the welding speed can reach 150~ 200m / min. due to the fast welding speed, strong self cooling effect of weldment, small heat affected zone and less oxidation, the weld has good microstructure and performance. The surface of weldment can not be cleaned before welding, so the efficiency is increased. There are many kinds of metals that can be welded, and there are many shapes and specifications of products.

以上為大家詳細(xì)介紹了關(guān)于高頻焊接定義原理及特點(diǎn)的相關(guān)內(nèi)容，希望上述內(nèi)容對(duì)大家有所幫助。

The above is a detailed introduction about the definition principle and characteristics of high frequency welding. I hope the above contents can be helpful to you.

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