Aluminum coils can significantly affect welding quality due to their unique properties. Aluminum has a high thermal conductivity, which requires more energy to weld, and can lead to rapid heat dissipation, affecting the weld's uniformity. Oxides on the aluminum surface can also interfere with the welding process, causing porosity and poor joint strength if not properly cleaned. Additionally, aluminum's low melting point can lead to distortion and warping if not managed correctly. The use of appropriate filler materials, proper cleaning, and precise control of welding parameters are crucial to achieve high-quality welds with aluminum coils.