一焊接風管是由鍍鋅和不銹鋼兩種材質的鋼帶經過焊接工藝成型的管道，焊接口緊密、密封性好，可過水不漏，確保客戶使用不漏油不漏水的風管，風管的…

A welded air duct is a pipeline formed by welding two types of steel strips, galvanized and stainless steel, with tight welding joints and good sealing. It can pass through water without leakage, ensuring that customers use air ducts that do not leak oil or water

一焊接風管是由鍍鋅和不銹鋼兩種材質的鋼帶經過焊接工藝成型的管道，焊接口緊密、密封性好，可過水不漏，確保客戶使用不漏油 不漏水的風管，風管的使用壽命長達10年以上，適用于中高壓排風除塵系統及廢氣處理系統，風管可做成2.44米3米6米8米一接（建議用2.44-3米一節）。焊接風管廣泛應用于工廠和工業生產中。焊接風管又稱焊管，是由鋼板或鋼帶壓接成型后制成的固定長度為6m的鋼管，具有生產工藝簡單、生產效率高、品種規格多、設備投資少等優點，但其綜合強度低于無縫鋼管。

A welded air duct is a pipeline formed by welding two types of steel strips, galvanized and stainless steel. The welding joint is tight and the sealing is good, and it can pass through water without leakage, ensuring that customers use air ducts without oil or water leakage. The service life of the air duct is more than 10 years, and it is suitable for medium and high pressure exhaust and dust removal systems and waste gas treatment systems. The air duct can be made into 2.44 meters, 3 meters, 6 meters, and 8 meters in one connection (it is recommended to use 2.44 to 3 meters in one section). Welded air ducts are widely used in factories and industrial production. Welded air duct, also known as welded pipe, is a steel pipe with a fixed length of 6m made by pressing and forming steel plates or steel strips. It has the advantages of simple production process, high production efficiency, multiple varieties and specifications, and low equipment investment, but its comprehensive strength is lower than that of seamless steel pipes.

1、焊前準備

1. Preparation before welding

（1）根據板厚形式，坡口加工采用機加工、等離子弧切割或碳弧氣刨。采用碳弧氣刨、坡口和手工電弧焊時，為避免飛濺金屬的損傷，應在坡口兩側涂石灰粉。

(1) According to the thickness form of the plate, groove processing adopts machining, plasma arc cutting, or carbon arc air gouging. When using carbon arc air gouging, bevel welding, and manual arc welding, to avoid damage from splashing metal, lime powder should be applied on both sides of the bevel.

（2）應采用V型坡口，焊接電流應小，以防止不銹鋼的晶間腐蝕。

(2) V-shaped grooves should be used, and the welding current should be small to prevent intergranular corrosion of stainless steel.

（3）為了滿足相同性能的接頭，焊接材料的選擇應遵循“等成分”的原則。同時應注意風管焊接接頭中的鐵素體含量不宜過多，以提高接頭的抗熱裂和抗晶間腐蝕的能力。

(3) In order to meet the same performance of joints, the selection of welding materials should follow the principle of "equal composition". At the same time, it should be noted that the ferrite content in the welded joints of air ducts should not be too high to improve the joint's ability to resist thermal cracking and intergranular corrosion.

（4）采用嚴格的定位焊，遵循“短而厚”和“不焊透點焊”的原則。

(4) Strict positioning welding is adopted, following the principles of "short and thick" and "non penetration spot welding".

2、焊接技術要求

2. Welding technical requirements

（1）手工電弧焊采用直流反接，氬弧焊采用直流電連接。

(1) Manual arc welding adopts DC reverse connection, while argon arc welding adopts DC connection.

（2）風管焊接前，用不銹鋼絲將焊絲表面的氧化皮刷掉，用丙酮清洗干凈，然后晾干，隨時使用。

(2) Before welding the air duct, brush off the oxide layer on the surface of the welding wire with stainless steel wire, clean it with acetone, then air dry and use it at any time.

（3）打底焊時，焊縫厚度應盡量薄，有利于與根部熔合良好；熄弧時，應呈緩坡狀，如有止弧縮孔，應用拋光機打磨掉。必須在坡口內起弧和滅弧，并填滿弧坑，防止弧坑開裂。

(3) When backing welding, the thickness of the weld seam should be as thin as possible, which is conducive to good fusion with the root; When extinguishing the arc, it should be in a gentle slope shape. If there is any arc stopping shrinkage hole, it should be polished off with a polishing machine. Arc initiation and extinguishing must be carried out within the groove, and the arc crater must be filled to prevent cracking.

（4）為防止碳化物析出敏化和晶間腐蝕，應嚴格控制層間溫度和焊后冷卻速度，將層間溫度控制在60℃以下。

(4) To prevent carbide precipitation sensitization and intergranular corrosion, the interlayer temperature and post weld cooling rate should be strictly controlled, and the interlayer temperature should be controlled below 60 ℃.

（5）焊接時盡量采用氬弧焊手柄技術，該工藝能控制焊接層的表面顏色和形狀，焊接效果理想。

(5) When welding, try to use argon arc welding handle technology as much as possible. This process can control the surface color and shape of the welding layer, and the welding effect is ideal.

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