复合钢板是由不锈钢、镍基合金、铜基合金或钛板为复层，珠光体钢为基层，以爆炸焊、复合轧制、堆焊等方法制成的双金属板材。那么复合钢板的焊接要点是什么内容呢？

Clad steel plate is a bimetallic plate made of stainless steel, nickel base alloy, copper base alloy or titanium plate with pearlitic steel as the base, and by explosive welding, composite rolling, surfacing and other methods. So what are the key points of clad steel plate welding?

1、焊接方法

1. Welding method

在焊接复合钢板时，通常采用焊条电弧焊、埋弧焊、钨氩弧焊、CO2气体保护焊及等离子弧焊等焊接方法。目前常用钨氩弧焊或焊条电弧焊焊接复层，用埋弧焊或焊条电弧焊焊接基层。

When welding clad steel plates, welding methods such as electrode arc welding, submerged arc welding, tungsten argon arc welding, CO2 gas shielded welding and plasma arc welding are usually used. At present, tungsten argon arc welding or electrode arc welding are commonly used to weld the cladding, and submerged arc welding or electrode arc welding is used to weld the base course.

2、坡口形式

2. Groove form

对接接头坡口形式可采用V形、X形、V和U联合形坡口。也可以在接头背面一小段间隔内进行机械加工，去掉复层金属，以确保焊接基层焊道时不使基层焊肉焊到复层上。一般尽可能采用X形坡口双面焊，先焊基层，再焊过渡层，后焊复层，以保证焊接接头具有较好的耐腐蚀性。

V-shaped, X-shaped, V-shaped and U-shaped grooves can be used for butt joints. Machining can also be carried out at a short interval on the back of the joint to remove the clad metal, so as to ensure that the base weldment is not welded to the clad when welding the base weld bead. Generally, x-groove double-sided welding is adopted as far as possible, first welding the base layer, then welding the transition layer, and then welding the cladding, so as to ensure that the welded joint has good corrosion resistance.

同时，还应考虑过渡层的焊接特点，尽量减少复层一侧的焊接工作量。无论复层位于内侧或外侧，均先焊接基层。复层位于内侧时，在焊复层以前应从内侧对基层焊根进行清根。复层位于外侧时，应对基层后焊道进行修磨光。焊复层时，先焊过渡层，再焊复层。

At the same time, the welding characteristics of the transition layer should also be considered to minimize the welding workload on the side of the cladding. No matter whether the cladding is on the inside or outside, the base course shall be welded first. When the cladding is on the inside, the root of the base course shall be cleaned from the inside before welding the cladding. When the cladding is located on the outside, the rear weld bead of the base shall be polished. When welding the cladding, weld the transition layer first and then the cladding.

3、填充金属选择

3. Filler metal selection

在大多数情况下，选用合适的中间填充金属作为钢的过渡层，从而控制复层金属终焊道的含铁量，避免复层和基层处焊道产生脆化、裂纹等，保证复层焊道的耐蚀、耐磨等特殊性能。

In most cases, appropriate intermediate filler metal is selected as the transition layer of steel, so as to control the iron content of the final weld bead of the clad metal, avoid embrittlement and cracks in the weld bead at the clad and base layer, and ensure the corrosion resistance, wear resistance and other special properties of the clad weld bead.

4、焊接顺序及焊材选用

4. Welding sequence and welding material selection

通常先焊基层，道基层（碳钢、低合金钢）焊缝不应熔透到复层金属，以防焊缝金属发生脆化或产生裂纹。

Generally, the base course shall be welded first, and the weld of the first base course (carbon steel, low alloy steel) shall not be penetrated into the clad metal to prevent embrittlement or crack of the weld metal.

焊（堆焊）复层一侧时，必须考虑稀释的影响。所以在焊接复合板的复层时，应选择合适的填充金属先堆焊一层或多层过渡层，然后再焊复层。过渡层的填充金属必须能容许基层钢的稀释。

When welding (surfacing) one side of the cladding, the influence of dilution must be considered. Therefore, when welding the cladding of clad plate, appropriate filler metal should be selected, first surfacing one or more transition layers, and then welding the cladding. The filler metal of the transition layer must be able to allow the dilution of the base steel.

根部可用碳弧气刨、铲削或磨削法进行清根。在堆焊过渡层前，必须焊根坡口中的任何残余物。

The root can be cleaned by carbon arc gouging, chipping or grinding. Before surfacing the transition layer, any residue in the weld root groove must be removed.

要焊后热处理以焊接残余应力，选择热处理温度时应考虑:基层和复层的热处理规范的差异;对复层耐蚀性的影响;基层和复层界面的元素扩散是否会产生脆性相，导致钢板性能恶化;由于基层和复层的物理性能差异，导致复层产生应力腐蚀开裂等。

To eliminate welding residual stress by post weld heat treatment, the following factors should be considered when selecting heat treatment temperature: the difference of heat treatment specifications between base course and clad course; Influence on the corrosion resistance of the coating; Whether the element diffusion at the interface between the base layer and the composite layer will produce brittle phase, resulting in the deterioration of the properties of the steel plate; Due to the difference in physical properties between the base course and the composite layer, stress corrosion cracking occurs in the composite layer.

5、焊后热处理

5. Post weld heat treatment

济南复合板厂提醒，应力热处理可在焊完基层后进行，然后焊过渡层，再焊复层。热处理温度取下限，延长保温时间。更多相关内容就来我们网站http://www.jnjgcg.com咨询吧。

Jinan composite board factory reminds that stress relief heat treatment can be carried out after welding the base course, then welding the transition layer, and then welding the cladding. Take the lower limit of heat treatment temperature and extend the holding time. Come to our website for more relevant content http://www.jnjgcg.com Consult.