本申请涉及一种镍三铝药芯焊丝及其制备方法，镍三铝药芯焊丝包括药芯和焊皮，药芯包括金属芯和金属粉，药芯填充于焊皮中，金属芯为纯铝丝，金属粉按质量百分比由以下组分组成：含Mn80%的锰铁粉9‑11%，含钛70%的钛铁粉6‑7%，含硼20%的硼铁粉6.5‑7.5%，其余为铁粉。焊皮为纯镍带。金属粉由下述质量百分比的组分组成：含Mn80%的锰铁粉10‑10.5%，含钛70%的钛铁粉6.2‑6.6%，含硼20%的硼铁粉6.7‑7.2%，其余为铁粉。镍三铝药芯焊丝的制备方法包括以下步骤：以纯镍带作为焊皮原料，以纯铝丝作为药芯金属芯，以锰铁粉、钛铁粉、硼铁粉、铁粉作为药芯金属粉组分，镍带去油干燥、药芯金属粉混合配料并干燥，镍带轧制、药芯金属芯和金属粉装入焊皮中，拉拔成镍三铝药芯焊丝。本申请具有细丝径低成本，耐磨、工艺性能好等特点。

This application relates to a nickel trialuminum flux-cored welding wire and a preparation method thereof. The nickel trialuminum flux-cored welding wire includes a flux core and a solder skin. The flux core includes a metal core and a metal powder. The flux core is filled in the solder skin, and the metal core is pure Aluminum wire and metal powder are composed of the following components in terms of mass percentage: Mn80%-containing ferromanganese powder 9-11%, titanium-containing 70% ferro-titanium powder 6-7%, and boron containing 20% boron-iron powder 6.5-7.5 %, the rest is iron powder. The solder skin is a pure nickel belt. The metal powder is composed of the following components by mass percentage: 10-10.5% of ferromanganese powder containing 80% Mn, 6.2-6.6% of ferro-titanium powder containing 70% of titanium, and 6.7-7.2% of ferroboron powder containing 20% of boron. The rest is iron powder. The preparation method of nickel trialuminum flux-cored welding wire includes the following steps: pure nickel strip is used as the raw material of the welding skin, pure aluminum wire is used as the core metal core, and ferromanganese powder, titanium iron powder, boron iron powder, and iron powder are used as the core metal powder. Components, nickel strip degreasing and drying, flux-cored metal powder mixing ingredients and drying, nickel strip rolling, flux-cored metal core and metal powder are loaded into the solder skin, drawn into nickel tri-aluminum flux-cored welding wire. This application has the characteristics of low cost of fine wire diameter, wear resistance, and good process performance.