PWM 315AL:

is a 315A AC transformer arc welding machine designed for heavy-duty stick (MMA) welding. It operates on 220/440V power, with a 60–315A adjustable current range and supports 2–6 mm electrodes, making it suitable for medium to heavy steel work.
Built with an aluminum coil transformer, it offers durable performance and stable arc output, with a 35% duty cycle for continuous industrial tasks. However, it is large and heavy (~85 kg), making it best for fixed workshop use rather than portability.

PWM 500AL:

is a high-capacity 500A AC transformer welding machine built for intensive industrial welding applications. It runs on 220/440V, with a wide 100–500A current range, and supports 3.2–8 mm electrodes for thick materials and structural work.
It features an aluminum transformer coil, 35% duty cycle, and strong output performance, but is very heavy (~115 kg) and requires significant power input, making it ideal for large-scale fabrication and continuous heavy-duty use.