高热剂对低碳钢手工自蔓延焊接的影响

介绍了一种用于战场及野外应急抢修的新型焊接方法-手工自蔓延焊接,以低碳钢为焊接母材,对燃烧型焊条焊药中的高热剂组成、对燃烧速度及焊接质量的影响进行了探讨.结果表明,由Fe2O3 Al系铝热剂和CuO Al系铝热剂组成的高热剂,当CuO Al系含量不低于50%时,焊条燃烧产生足够的热量,实现试板的牢固连接,并达到单面焊双面成形的效果;随CuO Al系含量增加,焊条燃烧速度加快,焊缝抗拉强度降低,CuO Al系含量为50%和60%的焊条,焊条燃烧速度适中,焊接可控性好,且焊缝抗拉强度达420 MPa以上.金相分析表明,富铁第二相的析出对焊缝金属起到强化作用.

Effect of thermit composition on manual SHS welding for low carbon steel

Base on self-propagating high-temperature synthesis(SHS),a new method of welding called manual SHS welding is introduced.Since it is easy to carry and operate,this technique can be used in emergency maintenance.The effect of the thermit composition of the combustion welding rod on the welding of low carbon steel and the microstructure of weld were studied.The thermit was composed of(CuO Al) and(Fe2O3 Al).It is shown that when the content of(CuO Al) is higher than 50%,welding can successfully proceed.And combustion velocity becomes higher with the increasing of(CuO Al) content. This is due to the higher combustion temperature and larger combustion heat of (CuO Al) thermit.The tensile strength of weld becomes higher with the increasing of(Fe2O3 Al) content.This is due to the precipitation of the second phase rich in Fe,which can thin the Cu grain and strengthen the alloy.The combustion welding rod with 50% and 60%(CuO Al) thermit is easy to operate and the tensile strength of weld are higher than 420 MPa.