AMI’s 8 Series weld heads are a line of closed orbital TIG welding heads designed for welding tubes, thin-wall pipe, fittings, and similar components. Their narrow head design allows them to operate in tight-clearance environments, making them well suited for applications such as fitting-to-fitting welds, valve body connections, and densely packed process piping systems.
The 8 Series includes three models: 8-2000, 8-4000, and 8-6625. Together, they cover an outside diameter (OD) range from 1/4 in. to 6.625 in., providing versatility for a wide range of applications. Because of this flexibility and precision, the 8 Series is commonly used in industries such as semiconductor, pharmaceutical and biotech, aerospace, and food and beverage manufacturing.
For added convenience and accuracy, Model 8 weld heads feature a two-sided precision-machined clamping system that easily adjusts to diameter variations while delivering strong, consistent clamping force. The weld heads are also water-cooled, enabling reliable performance during extended duty-cycle operations.
8 series weld heads:
model 8-2000
Designed for tight clearance areas, the AMI 8-2000 weld head features a narrow head profile that allows it to access confined welding locations. With a tube OD range of 1/4″ to 2″, this compact orbital weld head is ideal for welding small-diameter tubing.
Frequently used in applications requiring high-purity welds, the 8-2000 excels at fitting-to-fitting welds, valve body connections, and other precision tube welding tasks.
Model 8-4000
The AMI 8-4000 is a mid-range orbital weld head designed for precision TIG fusion welding of tubes, thin-wall pipes, and fittings with an outside diameter range of ½″ to 4″ (12.7–104 mm). Its water-cooled design and narrow profile allow for reliable, repeatable welds in demanding environments.
The 8-4000 is commonly used in applications involving stainless steel process tubing, high-purity gas distribution systems, pharmaceutical and semiconductor process piping, and other industries requiring high-quality orbital welds.
model 8-6625
Like all weld heads in the Model 8 series, the 8-6625 is designed for precision autogenous orbital welding in tight-clearance environments. With an outside diameter (OD) capacity ranging from 2.00″ to 6.625″, this weld head enables reliable welding in restricted spaces.
Its narrow design makes it well suited for applications such as fitting-to-fitting welds, valve assemblies, and complex piping layouts where accessibility is limited.
Together, the AMI 8 Series weld heads offer a complete solution for high-precision orbital welding in tight and demanding environments. By combining compact design, reliable clamping, and water-cooled performance, the 8-2000, 8-4000, and 8-6625 provide consistent weld quality across a broad range of tube and pipe sizes. This versatility makes the 8 Series a trusted choice for industries where precision, repeatability, and reliability are essential.
