1、铝合金升降平台http://www.jnjbrpt.com/焊接接头力学性能不均匀，由于焊接接头各区在焊接过程中进行着不同的焊接冶金过程，并经受不同的热循环和应变循环的作用，各区的组织和性能存在较大的差异，焊接接头组织的不均匀，造成了整个接头力学性能的不均匀。
Aluminum uneven lifting platform properties of welded joints, weld joints due to the different districts engaged in welding metallurgy process during welding, and subjected to the action of different thermal cycling and strain cycle,

there is a big difference in the organization and performance of the districts, uneven welded joint, resulting in uneven entire joint mechanical properties.
　　
2、铝合金升降平台焊接接头工作应力分布不均匀，存在应力集中，由于焊接接头存在几何不连续性，致使其工作应力是不均匀的，存在应力集中。当焊缝中存在工艺缺陷，焊缝外形不合理或接头型式不合理时，将加剧应力集中程度，影响接头强度，特别是疲劳强度。
Aluminum lift platform welded joints uneven distribution of work stress, stress concentration, the presence of welded joints geometric discontinuity, resulting in the work stress is uneven, the presence of stress concentration. When there are defects in the weld process, joint type weld profile unreasonable or irrational, it will exacerbate the stress concentration, the impact of the joint strength, particularly fatigue strength.
　　
3、铝合金升降平台由于焊接的不均匀加热，引起焊接残余应力及变形，焊接是局部加热的过程，电弧焊时，焊缝处最高温度可达材料沸点，而离开焊缝处温度急剧下降，直至室温，这种不均匀温度场将在焊件中产生残余应力及变形，焊接残余应力可能与工作应力叠加，导致结构破坏，焊接变形可能引起焊接结构的几何不完善性。
Aluminum lift platform due to uneven heating of welding, welding residual stress and deformation caused by welding is local heating process, when arc welding, weld material temperatures up to the boiling point, the temperature at the

left seam sharp decline, until room temperature such non-uniform temperature field will produce residual stress and deformation, welding residual stress and work stress may be superimposed in the weldment, resulting in structural

damage, welding deformation may cause geometric imperfections of welded structures.

4、铝合金升降平台http://www.jnjbrpt.com/由于焊缝与构件组成整体，所以与铆接或胀接相比，焊接接头具有较大的刚性。
Aluminum lift platform, the overall composition of the weld and the member, so take compared with caulking or swelling, welded joint has greater rigidity.