鍍鋅方矩管具備抗腐蝕和使用期長的雙向優勢，并且價錢相對性較低，因此如今它的利用率也愈來愈高，可是一些人在焊接鍍鋅管時不留意，導致了一些不便，那麼焊接鍍鋅管時應當留意哪些難題呢？

　　Galvanized square and rectangular pipes have the advantages of corrosion resistance and long service life, and have a relatively low price. Therefore, their utilization rate is increasing. However, some people do not pay attention to welding galvanized pipes, which has caused some inconvenience. So, what difficulties should be paid attention to when welding galvanized pipes?

　　1、前提是要打磨

　　1. The prerequisite is to polish it

　　電焊焊接處的熱鍍鋅層務必打磨拋光掉，不然會出現汽泡、沙眼、假焊等。將會造成。這也將使焊縫變脆并減少其剛性。

　　The hot-dip galvanized layer at the welding point must be polished off, otherwise bubbles, sand holes, false welding, etc. may occur. It will cause. This will also make the weld brittle and reduce its rigidity.

　　2、鍍鋅方矩管的特點

　　2. Characteristics of galvanized rectangular pipes

　　鍍鋅鋼一般在高碳鋼的外邊涂上一層鋅，熱鍍鋅層一般為20um厚。鋅的熔點為419℃，沸點為908℃在電焊焊接中，鋅熔化成液體，飄浮在溶池表面或焊接根處。鋅在鐵中有挺大的固溶度，鋅液會沿晶界深層浸蝕焊接金屬，低溶點鋅會產生“形狀記憶合金脆裂”。

　　Galvanized steel is usually coated with a layer of zinc on the outer edge of high carbon steel, and the hot-dip galvanized layer is generally 20um thick. The melting point of zinc is 419 ℃ and the boiling point is 908 ℃. In electric welding, zinc melts into a liquid and floats on the surface of the molten pool or at the welding root. Zinc has a significant solid solubility in iron, and the zinc solution will deeply corrode the welded metal along the grain boundaries. Low melting point zinc will cause "shape memory alloy brittle fracture".

　　如果焊接角焊縫，尤其是T形接頭的角焊縫最容易產生穿透裂紋。鍍鋅鋼電焊焊接時，坡口表面和邊沿的鋅層在電孤加溫的功效下能造成空氣氧化、熔融、揮發，乃至冒煙和蒸氣的蒸發，非常容易導致焊接出氣孔。

　　If welding fillet welds, especially T-joint fillet welds, it is most likely to produce penetrating cracks. When welding galvanized steel, the zinc layer on the groove surface and edge can cause air oxidation, melting, volatilization, and even smoke and vapor evaporation under the effect of electric arc heating, which can easily lead to welding porosity.

　　空氣氧化產生的氧化鋅熔點高過1800℃，假如電焊焊接全過程中的主要參數不大，就會造成氧化鋅渣參雜物。次之，因為鋅的揮發，很多冒煙蒸發，對身體有刺激性和損害功效。因而，電焊焊接處的熱鍍鋅層務必打磨和解決。

　　The melting point of zinc oxide produced by air oxidation is higher than 1800 ℃. If the main parameters during the entire welding process are not large, it will cause zinc oxide slag impurities. Secondly, due to the volatilization of zinc, a lot of smoke evaporates, which has irritating and damaging effects on the body. Therefore, the hot-dip galvanized layer at the welding point must be polished and resolved.

　　3、鍍鋅方矩管焊接工藝控制

　　3. Welding process control of galvanized square and rectangular pipes

　　電焊焊接前鍍鋅鋼的制取與一般高碳鋼同樣。應留意當心解決帶槽規格和周邊的熱鍍鋅層。以便焊透，坡口規格盡可能，一般為60~65，留出一定空隙，一般為1.5~2.5mm；以便降低鋅滲入焊接中，能夠在電焊焊接前往除帶槽中的熱鍍鋅層。在實際上工作上，選用集中化倒圓角、無鈍邊技術性和兩層焊接工藝開展集中控制，減少了電焊焊接不徹底的概率。金屬電極應依據熱鍍鋅硬管的PCB原材料挑選。

　　The preparation of galvanized steel before welding is the same as that of general high carbon steel. Attention should be paid to resolving issues with groove specifications and the surrounding hot-dip galvanized layer. In order to facilitate welding penetration, the groove specification should be as large as possible, usually 60-65, leaving a certain gap, usually 1.5-2.5mm; in order to reduce zinc infiltration into the welding, the hot-dip galvanized layer in the groove can be removed during electric welding. In practical work, centralized control is carried out using centralized rounded corners, non blunt edge technology, and two-layer welding processes to reduce the probability of incomplete electric welding. Metal electrodes should be selected based on the PCB raw materials of hot-dip galvanized hard pipes.

　　4、鍍鋅方矩管焊接手法

　　4. Welding technique for galvanized rectangular pipes

　　當電焊焊接第一層多層高層電焊焊接時，盡可能使鋅層熔融、揮發并從焊縫中逸出，那樣能夠大大減少殘余在焊縫中的液體鋅。角焊縫電焊焊接時，鋅層應盡量在第一層熔化，揮發并揮發以從焊接中逸出。方式是將焊絲尾端往前挪動約5~7mm，隨后在熔化鋅層后返回原先的部位再次往前電焊焊接。針對水準電焊焊接和豎直電焊焊接，假如挑選短爐渣金屬電極，如J427，底切發展趨勢將十分小。假如選用前后左右帶材運送技術性，能夠得到無缺點的鍍鋅方矩管焊接品質.

　　When welding the first layer of multi-layer high-rise welding, try to melt, evaporate and escape the zinc layer from the weld seam as much as possible, which can greatly reduce the residual liquid zinc in the weld seam. When welding fillet welds, the zinc layer should be melted as much as possible in the first layer, volatilized and evaporated to escape from the weld. The method is to move the end of the welding wire forward by about 5-7mm, and then return to the original position after melting the zinc layer and welding it forward again. For horizontal and vertical welding, if short slag metal electrodes such as J427 are selected, the trend of bottom cutting development will be very small. If the use of front, back, left, and right strip transportation technology is adopted, it can achieve defect free welding quality of galvanized square rectangular pipes

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