1、鋁合金升降平臺http://www.xunda168.com.cn/焊接接頭力學性能不均勻，由于焊接接頭各區在焊接過程中進行著不同的焊接冶金過程，并經受不同的熱循環和應變循環的作用，各區的組織和性能存在較大的差異，焊接接頭組織的不均勻，造成了整個接頭力學性能的不均勻。
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、鋁合金升降平臺焊接接頭工作應力分布不均勻，存在應力集中，由于焊接接頭存在幾何不連續性，致使其工作應力是不均勻的，存在應力集中。當焊縫中存在工藝缺陷，焊縫外形不合理或接頭型式不合理時，將加劇應力集中程度，影響接頭強度，特別是疲勞強度。
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、鋁合金升降平臺由于焊接的不均勻加熱，引起焊接殘余應力及變形，焊接是局部加熱的過程，電弧焊時，焊縫處最高溫度可達材料沸點，而離開焊縫處溫度急劇下降，直至室溫，這種不均勻溫度場將在焊件中產生殘余應力及變形，焊接殘余應力可能與工作應力疊加，導致結構破壞，焊接變形可能引起焊接結構的幾何不完善性。
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、鋁合金升降平臺http://www.xunda168.com.cn/由于焊縫與構件組成整體，所以與鉚接或脹接相比，焊接接頭具有較大的剛性。
Aluminum lift platform, the overall composition of the weld and the member, so take compared with caulking or swelling, welded joint has greater rigidity.