Magnesium Machining and Fabrication in Lima, OH — AZ31B, AZ91D, WE43

AZ31B sheet and plate is the workhorse wrought magnesium alloy in Lima's industrial shops. With a yield strength near 22 ksi and excellent formability, it suits panels, covers, and formed brackets where press-brake or stretch-forming operations are needed. Welding with AZ31B filler rod in MIG or TIG processes is well within the skill set of Lima's certified fabricators, though preheat to 300-400°F and post-weld stress relief are standard practice to prevent cracking in restrained joints. AZ91D is the dominant die-cast grade and is sourced as near-net-shape castings from regional foundries. Its aluminum content (approximately 9%) and zinc addition give a tensile strength around 23 ksi with excellent pressure-tightness for housings exposed to oil or coolant. Lima buyers specifying AZ91D should confirm porosity limits — typically ASTM E505 Level 2 or better — for components that carry hydraulic pressure. WE43 enters the picture when operating temperatures exceed 250°F or when creep resistance matters over long service intervals. The rare-earth additions (yttrium plus mixed rare earths) stabilize the grain boundary at elevated temperature, making WE43 the alloy of choice for defense electronics enclosures and high-cycle engine-adjacent structures. Machinability is more challenging than AZ31B, demanding tighter coolant management and sharper tooling, but Allen County shops with aerospace experience handle WE43 routinely.

Magnesium machining generates fine chips and dust that are combustible, and Lima's ISO 9001-certified shops maintain written chip-management procedures as a baseline requirement. Wet machining with mineral-oil-based coolant (not water-soluble fluids, which react with magnesium) is the preferred approach for production runs. Class D fire extinguishers and dry-sand suppression systems are on-hand in compliant facilities. Buyers auditing Lima suppliers should request the facility's magnesium safety protocol as part of the qualification checklist. Finishing options for magnesium in Lima include chromate conversion (for maximum corrosion resistance, per MIL-M-3171 Type I or III), anodizing (HAE or Dow 17 processes), and powder coat over conversion-coated surfaces. Defense components often require ITAR-compliant handling, and several Lima shops maintain ITAR registration, controlling technical data access and limiting foreign national exposure on controlled programs. Surface roughness targets of Ra 63 microinch or better are achievable on CNC-milled magnesium faces without grinding.

ManufacturingBase indexes Lima-area suppliers by material capability, certification, and production volume — allowing defense primes, Tier 1 automotive buyers, and industrial OEMs to identify qualified magnesium shops without cold-calling regional directories. Search filters for AZ31B sheet work, AZ91D casting secondary machining, and WE43 precision parts surface vetted shops with documented process controls. Lead times for magnesium machined parts in Allen County typically run 3-6 weeks for prototype quantities and 8-14 weeks for production releases with SPC documentation. Buyers with NRE-sensitive programs can often negotiate first-article inspection (FAI) to AS9102 standards with Lima shops that serve defense primes. ManufacturingBase's RFQ routing ensures your BOM-level specifications — alloy, temper, surface treatment, and drawing revision — reach suppliers already equipped to quote accurately without back-and-forth clarification.