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用HO8Mn2SiA细丝CO_2冷焊铸铁存在的问题:1.焊缝熔合区存在微气孔;2.焊缝熔合区附近加工性较差;3.用于焊补灰口铸铁的合适规范较窄。通过在坡口底部加焊药,可以较好地解决这些问题。焊药中含有强石墨化元素,可以减少气孔,限制产生白口组织,焊药中还含有固氮成分(铝、钛),防止空气中氮的侵入(当焊药以粉末状加入,CO_2流量低时)。焊药具有较强的发热能力,即使用较小的规范焊补很小的缺陷时,仍不会产生熔合不良的情况。由于所用的线能量较小,所以加入的焊药量应很少。最理想的合金元素是铝,其次是钛。焊药主要由纯铁粉、钛铁矿粉、纯
The problems of cold welding cast iron with HO8Mn2SiA filament CO_2 are as follows: 1. There are micro-pores in weld fusion zone; 2. The workability near the welding zone is poor; 3. The suitable specifications for welding gray cast iron are narrow. These problems can be solved well by adding flux at the bottom of groove. Solder contains strong graphitization elements, can reduce the pores, limiting the production of white tissue, welding agent also contains nitrogen fixation (aluminum, titanium), to prevent the invasion of nitrogen in the air (when the welding powder to join, CO_2 low flow Time). Welder has a strong heat capacity, even with a smaller standard welding repair small defects, there will be no poor fusion situation. Due to the smaller line energy used, the amount of flux added should be small. The most ideal alloying element is aluminum, followed by titanium. Solder mainly from pure iron, ilmenite powder, pure