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复合钢板的焊接难点及解决方案

来源:http://www.jnjgcg.com/ 日期:2022-07-30 发布人:jiangucaigang
复合钢板的基层应满足接头强度和刚度的要求,复层应满足耐蚀等要求。为了保证复合钢板不失原有的综合性能,对基层和复层必须分别进行焊接。复合钢板的焊接难点及解决方案是什么?
The base course of composite steel plate shall meet the requirements of joint strength and stiffness, and the cladding shall meet the requirements of corrosion resistance. In order to ensure that the composite steel plate does not lose its original comprehensive properties, the base layer and the composite layer must be welded separately. What are the welding difficulties and solutions of clad steel plate?
1、焊接基层时
1. When welding base course
由于板厚较大,焊接接头承受有较大的拘束应力;在焊接热循环的作用下,热影响区易产生马氏体淬硬组织,使焊接接头硬度和脆性增加,韧性和塑性显着降低。这些因素都会导致焊接裂纹的产生。
Due to the large thickness of the plate, the welded joint bears a large restraint stress; Under the action of welding thermal cycle, martensite hardening structure is easy to produce in the heat affected zone, which increases the hardness and brittleness of the welded joint and significantly reduces the toughness and plasticity. These factors will lead to welding cracks.
为了有效预防焊接裂纹的产生,可采取的措施有:选用低氢型焊条;焊条使用前按要求进行烘干;仔细清理坡口表面水、油、锈等杂质;选择合理的焊接工艺参数,如焊前预热、焊后缓冷、采取多层多道焊、控制层间温度等;选择合适的施焊顺序,以减小焊接应力等。
In order to effectively prevent the occurrence of welding cracks, the following measures can be taken: select low hydrogen electrode; The welding rod shall be dried as required before use; Carefully clean the water, oil, rust and other impurities on the groove surface; Select reasonable welding process parameters, such as preheating before welding, slow cooling after welding, multi-layer and multi pass welding, and control interlayer temperature; Choose proper welding sequence to reduce welding stress, etc.
2、在用不锈钢焊条(A002)焊接复层时
2. When welding cladding with stainless steel electrode (a002)
易熔化基层,使焊缝金属成分稀释,从而降低焊缝金属的塑性及耐蚀性,熔合区的脆性明显增加。因此,焊接复层时,一定要控制焊接线能量,采用多层多道焊,以减小焊接熔深。
It is easy to melt the base layer, which dilutes the composition of weld metal, thus reducing the plasticity and corrosion resistance of weld metal, and significantly increasing the brittleness of fusion zone. Therefore, when welding cladding, we must control the welding line energy and adopt multi-layer and multi pass welding to reduce the welding penetration.
济南复合板厂
3、在用奥氏体钢焊条(A302)焊接过渡层时
3. When welding the transition layer with austenitic steel electrode (A302)
焊缝易产生热裂纹。同时,过渡区会发生碳的迁移过程:即碳由低铬的基层向高铬的不锈钢熔敷金属转移,因此,基层和复层的交界处形成高硬度的增碳层和低硬度的脱碳层,
The weld is easy to produce hot cracks. At the same time, the carbon migration process will occur in the transition zone: that is, the carbon will be transferred from the low chromium base to the high chromium stainless steel deposited metal. Therefore, a high hardness carburizing layer and a low hardness decarburizing layer will be formed at the junction of the base and the composite layer,
引起熔合区的脆化(或软化),持久强度降低,易产生疲劳裂纹。宜采用小直径焊条,快速多道焊,必要时可采用浇冷水的方法以加速冷却,阻止脱碳层的形成,使焊接接头具有高的强度和韧性。
Cause embrittlement (or softening) in the fusion zone, reduce the lasting strength, and easily produce fatigue cracks. Small diameter electrode should be used for fast multi pass welding. If necessary, cold water can be poured to accelerate cooling, prevent the formation of decarburization layer, and make the welded joint have high strength and toughness.
济南复合板厂认为复合钢板容器组对安装的关键是焊接问题,而焊接工作的关键是过渡层的焊接,因此,掌握以上复合钢板的焊接要点有必要。
Jinan clad steel plate factory believes that the key to the assembly and installation of clad steel plate containers is welding, and the key to welding is the welding of transition layer. Therefore, it is necessary to master the above welding points of clad steel plate.
复合钢板的焊接难点及解决方案就是以上内容了,希望给您帮助,更多信息咨询就来我们网站http://www.jnjgcg.com关注了解。
The welding difficulties and solutions of clad steel plate are the above contents. I hope to help you. For more information, please come to our website http://www.jnjgcg.com Pay attention to understand.
此文关键词: 济南复合板厂  

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