Quality Stainless Steel Welding

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Introduction

At Church Metal Spinning Co., Inc., precision and process control isn’t just a promise — it’s the foundation of every project we deliver. This case study highlights how our team validated the structural integrity of a welded AISI 439 stainless steel specimen through a metallography and macro-etch analysis. The majority of our seam welding work uses stainless steel materials primarily 304, 316, 409 and 439.

Low magnification micrograph of the as-polished specimen showing the location of the weld. Note that there is no lack of fusion or internal cracking in this specimen.
Figure 1: Low magnification micrograph of the as-polished specimen showing the location of the weld. Note that there is no lack of fusion or internal cracking in this specimen.

Client Challenge

Our customers expect components that meet demanding tolerances and stand up to real-world stress. In addition to destructive testing, performing internal macro-etch testing confirms that the weld is much stronger than the base material and did not have any negative impact on the base material.

  • Weld joints free of defects such as lack of fusion or internal cracking.

  • Microstructural reliability in stainless steel welding applications.

  • Dimensional consistency within strict tolerance bands.

Light micrograph of welded region shown in Figure 1 after etching to reveal the grain structure and making measurements ofvarious dimensions. Full ring illumination.
Figure 2: Light micrograph of welded region shown in Figure 1 after etching to reveal the grain structure and making measurements of various dimensions. Full ring illumination.

Process & Methodology

To confirm weld performance, a 1” × 3/8” butt joint specimen was analyzed using industry-leading procedures:

  1. Sample Preparation – Mounted in LECO Epoxy, vacuum infiltrated, ground through SiC papers (240–1200 grit), polished with diamond paste, and ultrasonically cleaned.

  2. Initial Microscopy – Inspected at 50× magnification using a Keyence VHX-7000 digital microscope; verified no fusion defects or cracks.

  3. Etching – Applied Vilella’s etch to reveal grain structure.

  4. Detailed Examination – Photomicrographs taken under both ring and co-axial illumination to document weld microstructure.

  5. Dimensional Analysis – Measurements conducted with Keyence software; annotated data summarized in dimensional tables.

Key Findings

  • No lack of fusion or internal cracking was detected in the stainless steel weld.

  • Weld microstructure showed sound metallurgical bonding.

  • Measurements validated our process controls, confirming the reliability of our stainless steel welding process.

  • Independent verification confirmed Church Metal’s manufacturing consistency and quality control.

Light micrograph of welded region shown in Figure 1 after etching to reveal the grain structure and making measurements ofvarious dimensions. Full co-axial illumination.
Figure 3: Light micrograph of welded region shown in Figure 1 after etching to reveal the grain structure and making measurements of various dimensions. Full co-axial illumination.

Outcome

This study reaffirmed our reputation as a trusted partner for stainless steel seam welding. By combining cutting-edge equipment with a robust ISO 9001:2015 quality system, we consistently deliver:

  • Parts manufactured to specification.

  • Reliable on-time delivery.

  • Continuous improvement through data-driven validation.

Conclusion

For industries where safety, reliability, and accuracy are non-negotiable, Church Metal offers more than parts — we deliver precision stainless steel welding backed by decades of expertise. This case study illustrates how our processes and quality systems ensure dependable performance, whether for prototypes or full production runs.
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