助銲劑對1020低碳鋼MIG銲件之影響

Abstract

本研究主要在探討活性助銲劑添加對SAE 1020低碳鋼銲道熔透深度與機械性質之影響。實驗材料選用SAE 1020低碳鋼，活性助銲劑選用MoO3、Fe2O3、SiO2、MgCO3四種flux，並運用既有混合四種配方MoO3(60%) +Fe2O3 (40%) 助銲劑、MoO3(60%)+SiO2(40%)助銲劑、MoO3(80%)+MgCO3助銲劑和Fe2O3(40%)+SiO2(60%)及目前業界廣泛使用之包藥銲線、裸線。 實驗結果顯示：(1)各種助銲劑均可有提高銲道穿深能力，在熱輸入量高時有顯著的高深寬比值。(2)以MoO3(60%)+Fe2O3(40%)混合型助銲劑所進行的MIG-flux製程，銲道穿深能力及深寬比值最優且效果最好。(3)若考慮助銲劑對SAE 1020銲道熔融面積之實驗結果，以MgCO3(100%)銲道所形成的熔融面積最大。(4)電漿電弧柱的收縮作用應是活性助銲劑有效提高銲道穿深能力的主要因素。(5)助銲劑的添加對SAE 1020碳鋼的硬度值無顯著的改變，但對極限抗拉強度有顯著的改變。

The purpose of this research is to study the effect of adding several fluxes on the weld penetration and mechanical properties of SAE 1020 carbon steel weldment using MIG weldimg process. The fluxes included MoO3, Fe2O3, SiO2, MgCO3 and mixed flux MoO3(60%)+Fe2O3(40%),MoO3(60%)+SiO2(40%),MoO3(80%)+MgCO3,Fe2O3(40%)+SiO2(60%) and flux core of SAE 1020 carbon steel. The results show : (1)All of seven active fluxes can increase weld penetration and depth/width ratio effectively, especially for high energy. (2)The flux MoO3(60%)+SiO2(40%) is the best of seven fluxes according to the weld penetration and depth/width ratio during MIG flux process. (3)The flux MgCO3 has greatest effect on the area of fusion zone. (4)The contraction of plasma arc is the major reasons of deep penetration of fusion zone with the use of flux. (5)Adding flux into the weldment can influence the mechanical properties.