Magnesium Machining and Fabrication in Lincoln, NE

AZ31B is the standard wrought magnesium alloy for sheet, plate, and extrusion applications. Its composition — nominally 3% aluminum, 1% zinc — gives it good room-temperature formability compared to other magnesium alloys, and it is the first choice when fabricators need to roll-form brackets, laser-cut blanks, or TIG-weld structural assemblies. Weld quality is critical: AZ31B requires argon shielding, preheat to 150–260°C for thicker sections, and post-weld stress relief to prevent cracking in the heat-affected zone. Lincoln welding-fabrication shops with certified AWS D1.1 or D1.3 welders typically adapt to magnesium procedures with modest process qualification effort. AZ91D is the dominant die casting alloy globally and the grade most Lincoln buyers encounter when sourcing magnesium castings for production volumes. It combines high fluidity, a wide casting temperature window, and a yield strength around 150 MPa with good surface finish — important for housings and covers that will be anodized or chromate-conversion coated for corrosion protection. Lincoln CNC shops post-machine AZ91D castings to final tolerances: hole locations to ±0.025 mm, surface finishes to Ra 1.6 µm, and threaded inserts installed with torque-specified heat staking are all routine operations. WE43 is specified when operating temperatures exceed the limit of aluminum-zinc magnesium alloys — typically above 150°C sustained. The tungsten and rare-earth additions in WE43 maintain creep resistance and tensile properties up to 250°C, making it the alloy of choice for powertrain-adjacent components, exhaust brackets, and aerospace structural parts. At roughly 280 MPa tensile and 200 MPa yield in the T6 condition, WE43 competes with mid-grade aluminum castings at one-third less density. Lincoln suppliers serving aerospace-defense primes sourcing through the regional supply chain will encounter WE43 specifications more frequently as OEMs push thermal performance limits.

Magnesium is highly machinable — cutting forces are low, tool life is long, and surface finishes achieve Ra 0.4 µm with standard carbide tooling — but the combustibility of magnesium chips and fines requires disciplined shop practices that Lincoln CNC operations must have in place before running production. Chip accumulation is the primary hazard: magnesium turnings ignite at approximately 650°C and burn at temperatures that water extinguishes only by explosive steam generation. Lincoln shops running magnesium use dry machining with air blast, collect chips in covered steel bins, and store them away from cutting fluid systems. Class D fire extinguishers — charged with dry sand, dry graphite, or proprietary Met-L-X powder — are mandatory at each machine tool. Cutting parameters for AZ31B and AZ91D follow high-speed dry protocols: surface speeds of 300–600 m/min on turning, feed rates of 0.1–0.3 mm/rev, and positive-rake carbide or PCD inserts to minimize chip recutting. Flood coolant is avoided; when misting is used, operators select non-aqueous cutting oils that will not react with active magnesium. Grinding magnesium is generally avoided in production; when deburring or finishing is required, operators use hand filing or carbide burrs under controlled conditions. Lincoln's aerospace-adjacent supply chain work — components destined for defense or aviation programs — adds ITAR registration and AS9100 Rev D documentation requirements to the standard ISO 9001 quality system. First article inspection reports, material certifications to AMS 4375 (AZ31B sheet) or AMS 4490 (AZ91D die casting alloy), and full dimensional ballooning of engineering drawings are expected deliverables. Buyers qualifying Lincoln suppliers for magnesium programs should confirm the shop's fire suppression infrastructure, chip handling SOP, and quality management system scope before placing initial orders.

Raw magnesium billet, sheet, and plate for Lincoln machining operations flows primarily through national metals distributors with regional warehouses in Omaha — approximately 60 miles northeast on I-80 — with standard lead times of 3–7 business days for AZ31B sheet in thicknesses from 0.5 mm to 25 mm and AZ91D ingot for casting operations. WE43 billet is a longer-lead specialty item, typically 4–8 weeks from aerospace-grade stock distributors, and buyers should plan accordingly for development programs. Die casting capacity for AZ91D is available through regional job shops serving the Midwest industrial corridor, with some operations maintaining dedicated magnesium press cells with vacuum-assist capability to reduce porosity in structural castings. Wall thicknesses below 1.5 mm are achievable in production tooling with proper gate and runner design, and Lincoln buyers specifying cosmetic surfaces should call out class A surface requirements explicitly in the RFQ package along with coating specification — typically chromate conversion per MIL-M-3171 or anodize per AMS 2466 for corrosion performance in agricultural and outdoor environments. ManufacturingBase connects Lincoln procurement teams with qualified magnesium fabricators, die casters, and CNC machining shops across the regional and national supply chain. Search by alloy grade, process capability, and certification to shortlist suppliers capable of meeting your program's tolerance, volume, and documentation requirements.