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如何控制挖掘机加长臂焊接变形问题?

日期:2021-10-14   来源:http://www.dybocheng.com
我们都知道挖掘机的主要结构件是加长臂,一般都是使用焊接工艺。加长臂经过焊接加工会发生一定的形状改变,即焊接变形,这会严重影响构件后期使用的效果。那么加长臂焊接变形的主要形式及产生原因是什么呢?今天,加长臂挖掘机出租就带您一起来学习以下相关内容!
As we all know, the main structural part of excavator is lengthening arm, which generally uses welding process. The shape of the lengthening arm will change after welding, that is, welding deformation, which will seriously affect the later use effect of the component. What are the main forms and causes of welding deformation of the lengthening arm? Today, the extended arm excavator rental will take you to learn the following related contents!
加长臂焊接使用钢板厚度大部分在4~100mm之间,板厚规格跨度非常大,相应所采用的焊接工艺参数变化范围较大,导致焊接热出入及焊接热温度场的不均匀。因而如果在焊接过程中控制不当,焊接变形会很大,严重影响了挖掘机加长臂的加工质量以及整机的装配性。变形的基本类型有横向、纵向收缩,角变形,弯曲和波浪变形。
The thickness of the steel plate used for the welding of the lengthening arm is mostly between 4 ~ 100mm, the specification span of the plate thickness is very large, and the corresponding welding process parameters vary widely, resulting in uneven welding heat in and out and welding heat temperature field. Therefore, if the welding process is not controlled properly, the welding deformation will be great, which will seriously affect the processing quality of the excavator lengthening arm and the assembly of the whole machine. The basic types of deformation include transverse and longitudinal shrinkage, angular deformation, bending and wave deformation.
挖掘机结构件产生焊接变形的主要原因有:
The main causes of welding deformation of excavator structural parts are:
(1)结构型式设计不当,焊接时容易发生变形;(2)焊接接头的型式、焊缝布置不合理;;(3)控制焊接变形的工艺方法应用不当。
(1) Improper structural design, easy to deform during welding; (2) The type and weld arrangement of welded joints are unreasonable;; (3) Improper application of process methods to control welding deformation.
加长臂挖掘机出租
Extended arm excavator rental
对于控制挖掘机加长臂焊接变形的技术方法:
Technical methods for controlling welding deformation of excavator lengthening arm:
(1)采用焊接变形控制技术
(1) Welding deformation control technology is adopted
合理选择施焊方法和焊接工艺参数,应围绕结构中性轴平衡布置焊缝,合理选择焊接顺序,使用分段倒退焊和间断焊,预置反变形量,采用刚性固定等。对已经出现的变形常采用机械矫正和火焰矫正法,这些变形预防措施和矫正工艺主要是依靠经验和有限的试验数据,不能适应复杂多变的结构型式和焊接方法,而且焊接变形的矫正极为耗时、费力,甚至导致产品报废。
The welding method and welding process parameters shall be reasonably selected. The welds shall be arranged in a balanced manner around the neutral axis of the structure, the welding sequence shall be reasonably selected, segmental reverse welding and intermittent welding shall be used, the amount of reverse deformation shall be preset, rigid fixation shall be adopted, etc. Mechanical correction and flame correction are often used for the existing deformation. These deformation prevention measures and correction processes mainly rely on experience and limited test data, and can not adapt to complex and changeable structural types and welding methods. Moreover, the correction of welding deformation is extremely time-consuming and laborious, and even leads to product scrap.
(2)应用焊接变形预测方法
(2) Application of welding deformation prediction method
焊接数值模拟可通过对复杂或不可观察的焊接现象进行模拟和对极端情况下尚不知的规则进行预测,以弄清焊接过程的规律。数值模拟作为一种强有力的定量研究手段,不仅可以用来帮助理解焊接现象的本质,预测残余应力和变形,还可以此为工具,研究控制和减小残余应力,优化焊缝质量。
Welding numerical simulation can simulate complex or unobservable welding phenomena and predict unknown rules in extreme cases, so as to clarify the law of welding process. As a powerful quantitative research method, numerical simulation can not only help to understand the essence of welding phenomenon and predict residual stress and deformation, but also be used as a tool to study, control and reduce residual stress and optimize weld quality.
以上是有关如何控制挖掘机加长臂焊接变形问题的相关介绍,相信大家都有所了解了,如想要了解更多资讯欢迎点击我们的加长臂挖掘机出租http://www.dybocheng.com官网。
The above is about how to control the welding deformation of the lengthening arm of the excavator. I believe everyone knows something. If you want to know more information, please click our lengthening arm excavator rental http://www.dybocheng.com Official website.


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