Stainless Steel Laser Hermetic Sealing Welding

Challenges in Stainless Steel Welding

Stainless steel welding presents multifaceted technical barriers inherent to its material properties. The propensity for carbide precipitation in heat-affected zones critically compromises corrosion resistance, particularly in chloride-containing environments. Significant geometric distortion in thin-wall components, intensified by high thermal expansion coefficients, frequently exceeds conventional compensation capabilities. Chromium-rich oxide layers formed during thermal cycling destabilize laser energy coupling and alter molten pool metallurgy. Phase balance control in duplex grades demands precise thermal management to maintain optimal mechanical-corrosion synergy. Furthermore, machining contaminants exert disproportionate influence on weld integrity compared to other alloys, necessitating comprehensive clean manufacturing protocols.

Related Reading
  • Types of weld cracks
  • Reasons for the formation of pores
  • Determine the depth of weld penetration
  • Reasons for blackening of welds
  • Reasons for weld seam undercutting
  • How to avoid cracks
  • Testing the quality of weld seams
  • Check the sealing effect
Laser Hermetic Sealing Advantages

Laser technology revolutionizes stainless steel sealing through innovative solutions. Advanced beam modulation achieves unprecedented thermal input control, effectively suppressing HAZ degradation. Synergistic application of 3D adaptive fixturing and beam oscillation technology reduces distortion beyond conventional process limits. Integrated dynamic inert gas shielding ensures metallurgical purity while inhibiting surface oxidation. Proprietary thermal cycle protocols optimize ferrite-austenite phase balance in duplex grades. Multi-stage cleaning processes within full-contamination-controlled environments eliminate defect risks. This methodology has obtained medical-grade hermetic certifications and food contact compliance, delivering reliable encapsulation for chemical processing systems and implantable medical devices.

Related Equipment
sensor shell
Laser Hermetic Stainless Steel​ Case

  • Material

    304 stainless steel

  • Weld seam inspection

    The weld seam is uniform and flat, without cracks, pores, oxidation blackening, etc

  • Helium Leak Test

    Detection results of helium mass spectrometer leak detector：1*10-9Pa·m³/s

Our Quality Management
Standardized process flow
  • Material testing
  • Welding pretreatment
  • Fixture positioning
  • Seal welding
  • Hermetic testing
Triple reliability verification

  • process monitoring

    Real time closed-loop control of welding energy; CCD monitoring system for molten pool morphology

  • Testing methods

    Metallographic analysis (weld penetration and defect detection); Helium mass spectrometry leak detection (sensitivity 5 × 10 ⁻13 Pa · m ³/s)

  • Environment Simulation

    Temperature shock test (-55 ℃) ↔+ 125 ℃ 1000 cycles); 85% RH humidity aging test (2000 hours)

Following standards
  • ASTM B209 Standard for Aluminum and Aluminum Alloy Plates
  • EN 485-2 Aluminum Welding Applicability Certification
  • AMS 2681E Aerospace Laser Welding Process Specification
  • MIL-STD-883 Method 1014 Sealing Test
  • GJB 548B-2005 Reliability of Microelectronic Devices
  • NADCAP Welding AC7114 Aerospace Special Process Certification
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