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焊接风管的焊接工艺要求有哪些?

来源:http://www.jnqsg.com/     发布时间:2024-01-29  

一管通焊接风管是由镀锌和不锈钢两种材质的钢带经过焊接工艺成型的管道,焊接口紧密密封性好,可过水不漏,确保客户使用不漏油 不漏水的风管,风管的使用寿命长达10年以上,适用于中高压排风除尘系统及废气处理系统,风管可做成2.44米3米6米8米一接(建议用2.44-3米一节)。焊接风管广泛应用于工厂和工业生产中。焊接风管又称焊管,是由钢板或钢带压接成型后制成的固定长度为6m的钢管,具有生产工艺简单生产效率高品种规格多设备投资少等优点,但其综合强度低于无缝钢管。

One pipe welded air duct is a pipeline formed by welding two types of steel strips, galvanized and stainless steel. The welding joint is tightly sealed and 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.

焊前准备

Preparation before welding

(1)根据板厚形式,坡口加工采用机加工等离子弧切割或碳弧气刨。采用碳弧气刨坡口和手工电弧焊时,为避免飞溅金属的损伤,应在坡口两侧涂石灰粉。

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

(2)应采用V型坡口,焊接电流应小,以防止不锈钢的晶间腐蚀。

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

(3)为了满足相同性能的接头,焊接材料的选择应遵循“等成分”的原则。同时应注意风管焊接接头中的铁素体含量不宜过多,以提高接头的抗热裂和抗晶间腐蚀的能力。

(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)采用严格的定位焊,遵循“短而厚”和“不焊透点焊”的原则。

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

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焊接技术要求

Welding technical requirements

(1)手工电弧焊采用直流反接,氩弧焊采用直流电连接。

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

(2)风管焊接前,用不锈钢丝将焊丝表面的氧化皮刷掉,用丙酮清洗干净,然后晾干,随时使用。

(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)打底焊时,焊缝厚度应尽量薄,有利于与根部熔合良好;熄弧时,应呈缓坡状,如有止弧缩孔,应用抛光机打磨掉。必须在坡口内起弧和灭弧,并填满弧坑,防止弧坑开裂。

(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)为防止碳化物析出敏化和晶间腐蚀,应严格控制层间温度和焊后冷却速度,将层间温度控制在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)焊接时尽量采用氩弧焊手柄技术,该工艺能控制焊接层的表面颜色和形状,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.

螺旋焊接风管,焊缝及其边缘应避免开孔。然后,焊后应清除焊缝处的熔渣,并用不锈钢丝刷或铜丝刷刷金属光泽,然后用酸洗膏酸洗钝化,再用热水清洗。

Spiral welded air ducts, welds and their edges should avoid drilling. Then, after welding, the slag at the weld seam should be removed, and the metal luster should be brushed with a stainless steel wire brush or copper wire brush. Then, acid pickling paste should be used for passivation, and hot water should be used for cleaning.

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