![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
The condensing tube is not considered to be a steel composite steel plate a force swv grid design mouth Hu Wei in the process of manufacturing stainless steel composite steel plate pressure vessel due to the slope U plus I. size error, resulting in the transition layer position is up or down, and welding Welding quality is difficult to control during welding, and defects such as cracks and slag inclusions are often generated at the transition layer, by improving the slope n form and size. Effectively ensure the welding quality of the transition layer. First, the current standard and existing problems 1. The current standard 3 is present. The standards for welding stainless steel clad steel plates are r, B8165-87 "Stainless steel clad steel plates" and GIVTl 3 丨 48-91 "Stainless steel clad plate welding technical conditions". "The root or face of the weld bead should be 12 mm away from the composite layer, and the thickness of the transition layer should not be less than 2 mm *." The molten metal of the transition layer must be completely covered with the carbon steel layer. Carbon steel h = 1.5 ~ 2.5mm, cover the interface between stainless steel and carbon steel a = 0.5 ~〗. The groove form and size recommended by 5mnr are as follows: 2. Existing problems. Over the years, these two technical conditions have played a very important role as a guiding document for welding stainless steel clad steel plates, effectively ensuring the welding quality of stainless steel clad plates. But according to the actual production and application, there are still the following JL problems.
â‘´The interface is not clear. In the welding process, the welder often cannot distinguish the interface between the base layer and the cladding layer, and it is easy to weld the base layer carbon steel electrode to the cladding stainless steel. The joint produces martensite structure and cracks and other defects.
(2) Push welding thickness cannot meet the requirements. It is difficult to guarantee the technical conditions by relying on manual operation. 2. Bevel design and its advantages 1. Design idea. Plane a step 1.5 to 2.5 mm deep below the compound layer, and make the edge of the compound S slope 3 to 5 mm away from the base layer groove. See the form and size of the groove.
â‘´ The location of the transition layer is clear. The interface between the base layer and the multi-layer is clear, and the position of the transition layer is clearly marked. There will be no welding of carbon steel electrodes to the multi-layer. The welder has no psychological burden and is handy when welding.
(2) Avoid slag inclusions. The edge of the cladding is far away from the center of the welding seam. Therefore, during the welding thermal cycle, the maximum peak temperature is greatly reduced, which avoids the expansion of the cladding due to repeated thermal expansion when welding the base layer, and the possibility of slag inclusion.
(3) Ensure the thickness of the transition layer. The transition layer can completely cover the base layer, and can reach the a and b values ​​required in the technical conditions, to ensure the welding quality of the transition layer, so that it can really play the role of ups and downs.
Years of practice have proved that this groove can better guarantee the welding quality of stainless steel composite plates, and it has certain value for the design of other types of composite material welding grooves. (Author unit: Mudanjiang Boiler and Pressure Vessel Inspection Center) The weld bead required to ensure that the root of the grassroots or the distance between the face layer and to ensure that a = 0 to ensure the welding quality of the transition layer is very important.
(3) Cause slag inclusion. Due to the different expansion coefficients of the base layer and the multi-layer material, under the action of the welding thermal cycle, there is a large internal stress between the base layer and the multi-layer, which is easy to cause the base layer and the multi-layer to open at the edge of the groove, and slag inclusion is likely to occur during welding.
Quality World 51
The products are made of imported PVC materials, environmental protection paint, computer color matching and artificial color painting. Every product has been strictly controlled before entering the market and enjoys three-year quality assurance. All models were taken in kind.
Human Anatomy Model,Human Anatomical Model,Human Anatomy 3D Model,Human Body Anatomy Model
Xinxiang Vic Science&Education Co.,Ltd. , https://www.hnhumananatomymodel.com