埋弧焊螺旋方管VS直縫高頻焊方管的區(qū)別

埋弧焊螺旋方管是以連續(xù)焊絲作為電極和填充金屬，工作時在焊接區(qū)的上面覆蓋一層顆粒狀焊劑，電弧在焊劑層下燃燒，將焊絲端部和局部母材熔化，形成焊縫在電弧熱的作用下，上部分焊劑熔化熔渣并與液態(tài)金屬發(fā)生冶金反應(yīng)。熔渣浮在金屬熔池的表面，一方面可以保 護焊縫金屬，防止空氣的污染，并與熔化金屬產(chǎn)生物理化學(xué)反應(yīng)，改善焊縫金屬的萬分及性能；另一方面還可以 使焊縫金屬緩慢泠卻。 埋弧焊可以采用較大的焊接電流，最大的優(yōu)點是焊縫質(zhì)量好，焊接速度高。因此，它特別適于焊接大口徑的螺旋方管。而且多數(shù)采用自動化焊接，目前已廣泛用于碳鋼、低合金結(jié)構(gòu)鋼和不銹鋼的焊接。 Submerged arc welding (SAW) for spiral square pipe is a continuous welding wire as the electrode and filler metal. When working, the welding area is covered with a layer of granular flux. The arc burns under the flux layer. The end of the welding wire and the local base metal are melted to form a weld under the action of arc heat. The upper part of the flux melts the slag and reacts with the liquid metal. Slag floating on the surface of metal molten pool can protect weld metal, prevent air pollution, and react with melted metal physicochemically to improve the versatility and properties of weld metal. On the other hand, it can slow down the cooling of weld metal. Submerged arc welding can use a larger welding current, the greatest advantage is that the quality of the weld is good and the welding speed is high. Therefore, it is especially suitable for welding large diameter spiral square tubes. And most of them use automatic welding, which has been widely used in the welding of carbon steel, low alloy structural steel and stainless steel.

高頻焊同頻焊是它是一種固相電阻焊方法，高頻焊根據(jù)高頻電流在工件中產(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，高頻電流通過與工 件機械接觸而傳入工件。感應(yīng)高頻焊時，高頻電流通過工件外部感應(yīng)圈的耦合作用而在工件內(nèi)產(chǎn)生感應(yīng)電流。 高頻焊是專業(yè)化較強的焊接方法，要根據(jù)產(chǎn)品配備專用設(shè)備。生產(chǎn)率高，焊接速度可達30m/min。以固體電阻熱為能源，焊接時利用高頻電流在工件內(nèi)產(chǎn)生的電阻熱使工件焊接區(qū)表層加熱到熔化或接近 的塑性狀態(tài)，隨即施加（或不施加）頂鍛力而實現(xiàn)金屬的結(jié)合。

High frequency welding is a solid phase resistance welding method. High frequency welding can be divided into contact high frequency welding and induction high frequency welding according to the way that high frequency current generates heat in the workpiece. When contacting high frequency welding, high frequency current is transmitted to the workpiece through mechanical contact with the workpiece. In induction high frequency welding, the high frequency current generates the induction current in the workpiece through the coupling effect of the induction coil outside the workpiece. High frequency welding is a highly specialized welding method, which should be equipped with special equipment according to the products. High productivity, welding speed up to 30 m/min. With solid resistance heat as energy source, the surface layer of workpiece welding zone is heated to a melting or near plastic state by using resistance heat generated by high frequency current in the workpiece during welding, and then the forging force is applied (or not applied) and the real metal is combined.