Abstract
While the MIG arc brazing method provides significant potential for joining aluminum alloy to stainless steel, the welding process is still hard to examine and control quantitatively. In this work, pulse on pulse was applied to improve the stability of conventional pulse gas metal arc brazing (P-GMAB) process, which was determined by measurement of welding current and voltage signals. The results based on time domain and frequency domain analysis demonstrate that the welding process stability of pulse on pulse gas metal arc brazing (PP-GMAB) far outweighs that of P-GMAB. These quantitative results are tested and validated with experimental results. The metal transfer mode of P-GMAB was the blend of one drop per pulse (ODPP) and multiple drops per pulse (MDPP). However, for high energy pulse of PP-GMAB, the droplet transfer mode is primarily ODPP with a few number of two drop per pulse (TDPP); for low energy pulse, the metal transfer maintains ODPP through the whole welding process. The improved weld formation by employing the pulse on pulse mode is due to its stabler welding process.
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