1、鋁合金升降平臺(tái)http://www.www.gz-healths.cn/焊接接頭力學(xué)性能不均勻，由于焊接接頭各區(qū)在焊接過(guò)程中進(jìn)行著不同的焊接冶金過(guò)程，并經(jīng)受不同的熱循環(huán)和應(yīng)變循環(huán)的作用，各區(qū)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(gè)接頭力學(xué)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(tái)焊接接頭工作應(yīng)力分布不均勻，存在應(yīng)力集中，由于焊接接頭存在幾何不連續(xù)性，致使其工作應(yīng)力是不均勻的，存在應(yīng)力集中。當(dāng)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(shí)，將加劇應(yīng)力集中程度，影響接頭強(qiáng)度，特別是疲勞強(qiáng)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(tái)由于焊接的不均勻加熱，引起焊接殘余應(yīng)力及變形，焊接是局部加熱的過(guò)程，電弧焊時(shí)，焊縫處最高溫度可達(dá)材料沸點(diǎn)，而離開(kāi)焊縫處溫度急劇下降，直至室溫，這種不均勻溫度場(chǎng)將在焊件中產(chǎn)生殘余應(yīng)力及變形，焊接殘余應(yīng)力可能與工作應(yīng)力疊加，導(dǎo)致結(jié)構(gòu)破壞，焊接變形可能引起焊接結(jié)構(gòu)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(tái)http://www.www.gz-healths.cn/由于焊縫與構(gòu)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.