Influence of Preheating on Lamellar Gray Cast Iron for Surface Layer Welding applications with Plasma-Transferred Arc Powder and Metal Inert Gas Welding Processes with Duplex Steel as Filler Material
Influence of Preheating on Lamellar Gray Cast Iron for Surface Layer Welding applications with Plasma-Transferred Arc Powder and Metal Inert Gas Welding Processes with Duplex Steel as Filler Material
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预热对层状灰铸铁等离子转移弧粉末表面层焊接和双相钢填充金属惰性气体焊接工艺的影响
DOI：
10.1007/s11666-020-01014-9
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发表时间：
2020
影响因子：
3.1
通讯作者：
E. González Olivares
中科院分区：
文献类型：
--
作者：
U. Reisgen;M. Oechsner;R. Sharma;J. Ellermeier;G. Andersohn;T. Engler;E. Zokoll;B. Heider;E. González Olivares
灰铸铁在制造复杂几何形状部件方面的良好能力得到了广泛认可，但其耐腐蚀性差和可焊性低，使这种材料在某些工业应用中的使用变得复杂。可以通过使用焊接工艺的金属表面层来提高耐腐蚀性，并且填料和基材之间的稀释百分比较低。然而，焊接过程会对基材施加非常高的热负荷，对于铸铁来说，这可能会促进硬而脆的微观结构的形成，从而促进裂纹的形成。这项工作涉及采用冷金属过渡 (CMT) 技术通过等离子转移电弧粉末 (PTA-P) 或金属惰性气体 (MIG) 制成的层状灰口铸铁上的双相钢焊珠，重点是实现低稀释度、硬度和缺陷（内部孔隙率）。采用预热降低热影响区硬度，同时在保护气体中添加不同浓度的氦气，研究其对焊道几何形状和硬度的影响。结果表明，与 MIG-CMT 工艺相比，由于冷却速率较低，PTA-P 工艺导致稀释度和硬度值较低。此外，据观察，预热母材降低了热影响区的硬度，但增加了焊道的稀释度。
The good capacity of gray cast iron for the manufacture of complex geometry components is widely recognized, but its low resistance to corrosion and low weldability complicate the use of this material for some industrial applications. The corrosion resistance can be improved by metallic surface layers using welding processes with low percentages of dilution between the filler and base material. However, the welding processes impose very high heat load on the base material, which in the case of cast iron could promote the formation of hard and brittle microstructures, facilitating the formation of cracks. This work deals with weld beads of duplex steel on lamellar gray cast iron made either by plasma-transferred arc powder (PTA-P) or by metal inert gas (MIG) using the cold metal transfer (CMT) technology, with emphasis on achieving low dilution, hardness and imperfections (internal porosities). Preheating was used to reduce the hardness in the heat-affected zone, while different levels of helium were added in the shielding gas to study its effect on the geometry and hardness of the weld beads. The results showed that the PTA-P process resulted in lower values of dilution and hardness because of a low cooling rate compared to that of the MIG-CMT process. In addition, it was observed that preheating the base material reduced the hardness of the heat-affected zone but increased the dilution of the weld bead.
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