Practical extrusion knowledge, built for the real world
XtruAdvance publications translate decades of aluminum extrusion experience into practical guidance for productivity, quality, service, and technical problem-solving. Explore upcoming books and published white papers created to support stronger engineering decisions and better operational performance.
Productivity in Aluminum Extrusion
Quality in Aluminum Extrusion
Service in Aluminum Extrusion
Planned publication dates may be updated.
Blisters and Their Many Causes
Blisters are among the most common—and hardest to diagnose—defects in aluminum extrusion because many different conditions can produce similar symptoms. This paper groups the principal causes by blister morphology, giving extruders a clearer framework for identifying likely sources and troubleshooting more efficiently.
Experimental trials examine upset pressure, two-piece billets, hot shears versus log saws, and the influence of profile shape. The findings point to practical methods for reducing blister occurrence and selecting more reliable process conditions.
Hot log shears and saws improved extrusion efficiency by allowing logs to be cut to length, but they also increased the use of two-piece billets when the remaining log is too short for a full billet. Although this practice can improve recovery, it introduces a second transverse weld and is frequently associated with blister formation across a range of profile shapes.
Because two-piece billets can represent as much as 40 percent of production under some conditions, understanding their behavior is essential. This study examines billet upset, metal flow and blister occurrence to clarify the compromises involved and support more reliable extrusion practices.
The Extrusion of Two-Piece Billets
A Practical Approach for Comparing Extrudability: 6061 vs. 6005A
Extrudability is a key consideration for aluminum extruders, but comparing alloys can require significant time and material. This study presents a practical method for evaluating AA6061 and AA6005A using a single billet, beginning at a low extrusion speed and continuously increasing it throughout the test.
A specially designed die with peaks of varying sharpness connects die geometry with extrusion speed and tests how smaller radii can constrain performance. A controlled ram-speed curve allows the resulting extrusion to be measured directly against previous trials, providing a repeatable basis for comparing alloy behavior.
Evaluating Factors Affecting Profile Extrudability
Extrusion productivity is shaped by several interacting factors, including alloy, die design, operating conditions, and profile geometry. This study examines how extrudability is affected by variables such as die pocket size, bearing length, billet flow type, feature radii, and the thick-thin ratio of the profile.
To compare the impact of each variable, billets are extruded under continuously changing parameters until failure, with the results recorded and analyzed across repeated trials. The goal is to rank the influence of each factor and provide practical guidance for improving process reliability, reducing die redesigns, and optimizing future extrusion projects.
Measurement of Process Capability for Anodizing Color
As customers demand tighter color tolerances in anodizing, manufacturers face greater risks of rework and scrap. This paper explains why evaluating color capability is more complex than standard one-dimensional measurements, since anodized color must be assessed through the three-dimensional L a b color system. It offers a practical framework for understanding the minimum color variation, or delta E, generated by the process.
The study also examines how different process variables influence final color results and shows how capability analysis can be applied in a practical way. Although focused on anodizing, the same methodology can support color measurement and control in painting and other finishing processes where color consistency is critical.