The Harris AZ92T50 is an AZ92A magnesium TIG (GTAW) welding rod classified ERAZAl per AWS A5.19, packaged as 3/32 in (2.4 mm) diameter, 36-inch cut lengths in a 3 lb box. AZ92A composition — approximately 9% aluminum and 2% zinc — makes this filler rod ideal for repair welding magnesium castings, including AZ92A, AM100A, and similar high-aluminum cast magnesium alloys widely used in aerospace, automotive, and industrial equipment. Harris Products Group, a Lincoln Electric company, manufactures AZ92T50 to strict alloy chemistry standards for repair welding of magnesium alloys. WeldingMart is an authorized Harris distributor.
The 3/32 in diameter is the optimal choice for thin to medium magnesium casting sections (1/8–3/8 in wall thickness), providing adequate filler deposition rate without excessive heat input. Magnesium rapidly oxidizes, so the quality of shielding gas coverage and pre-cleaning directly determines weld quality.
| Specification | Value |
|---|---|
| AWS Classification | ERAZAl / AZ92A (AWS A5.19) |
| Harris Part Number | AZ92T50 |
| Diameter | 3/32 in (2.4 mm) |
| Length | 36 in (914 mm) |
| Package | 3 lb (1.4 kg) box |
| Al content | 8.3–9.7% |
| Zn content | 1.6–2.4% |
| Mn content | 0.10% min |
| Process | GTAW (TIG) |
| Polarity | ACHF (AC High Frequency) |
| Shielding Gas | 100% Argon (99.997%+ purity) |
| Base Metals | AZ92A, AZ91C, AM100A cast magnesium alloys |
- Cast magnesium housing repair: Repairing automotive transmission cases, engine crankcases, and compressor housings made from AZ92A or similar high-aluminum cast magnesium.
- Aerospace casting repair: Maintenance and repair work on aircraft gearbox casings, helicopter transmission components, and structural magnesium castings per OEM or FAA-approved procedures.
- Industrial machinery: Rebuilding worn or cracked magnesium pump housings, actuator bodies, and brackets in industrial equipment.
- Motorsport components: Repair welding cast magnesium wheels, brake calipers, and gearbox covers in racing applications.
| Parameter | AZ92A TIG (3/32 in rod) |
|---|---|
| Polarity | ACHF (AC with High Frequency start) |
| Shielding Gas | 100% Ar (99.997%+) |
| Flow Rate | 20–30 CFH (plus back purge for enclosed joints) |
| Tungsten | Pure (green) or Zirconiated, 3/32 in, balled tip (AC) |
| Amperage | 80–160 A (ACHF) |
| Preheat (castings) | 300–500 °F (150–260 °C) |
| Interpass Temp | ≤ 400 °F (204 °C) |
| Pre-clean | Stainless brush + acetone wipe; weld within minutes |
For casting repair, preheat evenly with a rosebud torch before welding to equalize thermal mass across the casting cross-section. Weld in stringer beads, allowing each pass to cool slightly below interpass temperature before continuing. Post-weld stress relieve per repair procedure if applicable (typically 300–400 °F for 1 hour for aerospace-grade castings).
Store in original sealed packaging in dry conditions at 40–80 °F. Magnesium alloy rods are susceptible to surface oxidation that causes porosity when welded. Handle with clean cotton gloves. Never use water to suppress a magnesium fire — use dry sand or a Class D extinguisher. Keep rods separated from aluminum and steel storage to prevent galvanic corrosion in humid storage environments.
Requires an AC/DC-capable GTAW machine with high-frequency start and adjustable AC balance. Lincoln Electric Square Wave TIG 200, Aspect 375, or Precision TIG 225 are suitable. See also Harris AZ61A Magnesium TIG Rod 1/8 in, Harris AZ92A Magnesium TIG Rod 1/8 in, and all welding wire.
- What is AZ92A magnesium welding rod used for?
- AZ92A is used primarily for repair welding cast magnesium alloys including AZ92A, AZ91, and AM100A. Its higher aluminum content (9%) compared to AZ61A (6%) makes it a better chemistry match for cast — rather than wrought — magnesium alloys.
- What is the difference between 3/32 in and 1/8 in AZ92A rod?
- Both are AZ92A alloy chemistry. The 3/32 in (2.4 mm) rod provides lower deposition rate and heat input, making it better suited for thin-section castings (wall thickness under 3/8 in) and precision repair work. The 1/8 in rod is appropriate for heavier sections (3/8 in+) where faster deposition is needed.
- Can I TIG weld magnesium with DCEN instead of ACHF?
- No. ACHF (AC with high frequency) is required for magnesium TIG welding. The AC cleaning action removes the tenacious magnesium oxide surface layer. DCEN does not provide this cleaning action, resulting in poor fusion, oxide inclusions, and contaminated welds.
- What preheat temperature is required for magnesium casting repair?
- Preheat to 300–500 °F (150–260 °C) is recommended for cast magnesium alloys. Preheating reduces thermal shock to the casting, improves fusion at the repair zone, and reduces the risk of heat cracking in the heat-affected zone. Use a digital pyrometer or temperature-indicating crayons to verify preheat.
- How do I clean magnesium castings before welding?
- Remove all oil, paint, and surface contamination with solvent (acetone or MEK) wipe. Then mechanically remove the oxide layer using a clean stainless-steel wire brush dedicated to magnesium only. Weld as soon as possible after cleaning — magnesium re-oxidizes rapidly and the clean window is short.
- Is magnesium flammable during welding?
- Solid magnesium castings and rod stock do not ignite readily under welding conditions with proper shielding. However, magnesium fines, chips, and dust are highly flammable. Do not grind magnesium without proper fume and fire precautions. Use Class D fire extinguishing agents only — never water, CO₂, or halon.
- What AWS standard covers magnesium welding rods?
- AWS A5.19, "Specification for Magnesium Alloy Welding Electrodes and Rods," governs the classification and testing requirements for magnesium filler metals including AZ61A (ERAZAl) and AZ92A (ERAZAl). Published by the American Welding Society.
Magnesium rapidly oxidizes in air, making proper shielding gas coverage the most critical process variable in AZ92A magnesium TIG welding. Maintain a large gas cup (No. 8 minimum) and gas lens to provide laminar argon flow that shields the entire molten weld pool and adjacent edges. The edges adjacent to the weld bead are particularly vulnerable — any turbulence in the shielding gas envelope allows atmospheric oxygen to reach the hot metal and form oxide inclusions. Wrought alloys and cast magnesium alloys both require the same rigorous shielding discipline, with the key difference being that wrought alloys (like AZ61A sheet) are less prone to cracking while cast alloys like AZ92A require preheat to manage thermal stress. For a box of 3 lb capacity at 3/32 in diameter, this product conforms to AWS A5.19 and is appropriate for maintenance and repair work on cast magnesium components in aerospace, automotive, and industrial equipment.
Harris AZ92T50 provides AZ92A magnesium TIG welding rod at 3/32 in x 36 in in a 3-piece box — the smaller diameter in the Harris AZ92A range, intended for thin-wall magnesium castings, precision aerospace components, and fine-detail repair work where 1/8 in rod deposits too much heat per pass. The AZ92A alloy chemistry (9% Al, 2% Zn, balance Mg) provides the highest room-temperature strength in the AZ magnesium alloy system, making it the standard filler for automotive and aerospace casting repair.
Both 3/32 in and 1/8 in AZ92A TIG rod weld the same base metal alloys. Diameter selection depends on:
| Criterion | 3/32 in (AZ92T50) | 1/8 in (AZ92T60) |
|---|---|---|
| Base Metal Thickness | < 3/16 in wall | > 3/16 in wall |
| Amperage Range | 60–110 A | 90–150 A |
| Joint Type | Thin-wall casting, fine cracks | Thick sections, structural joints |
| Filler Deposition | Lower — precise bead control | Higher — faster fill on deep joints |
| Typical Application | Aerospace components, instrument housings | Transmission cases, heavy engine parts |
For the majority of automotive magnesium casting repair (transmission covers, bellhousings, engine cases), 1/8 in AZ92A is more productive. For aerospace sheet and thin-wall structural castings where bead size must be minimized, 3/32 in is the correct choice. Both require AC TIG process, 100% argon shielding, and preheat per casting thickness.
Before welding, confirm the base metal alloy. Common magnesium casting alloys and their compatible fillers:
- AZ91 (die casting alloy, 9% Al, 1% Zn): Most common automotive die-cast magnesium. Weld with AZ92A filler — closest chemistry match. AZ61A is acceptable but slightly under-alloyed.
- AZ92A (high-strength casting, 9% Al, 2% Zn): Match-weld with AZ92A filler. Used in aircraft, high-performance automotive, and aerospace structural castings.
- AZ31 (wrought sheet/extrusion alloy, 3% Al, 1% Zn): Use AZ61A filler for a balanced chemistry between filler and base. AZ92A is acceptable but slightly over-alloyed.
- AZ61 (extrusion alloy, 6% Al, 1% Zn): Use AZ61A filler. Good weldability; used in structural extrusions.
- Unknown alloy: Default to AZ92A filler for die-cast automotive parts; AZ61A for wrought (sheet/tube/extrusion) parts.
Magnesium TIG rod requires no special storage beyond a clean, dry location. Unlike aluminum TIG rod, which oxidizes rapidly to a thick hygroscopic oxide, magnesium oxide forms more slowly and does not significantly affect weld quality if the surface discoloration is minor. However:
- Degrease rod with acetone before use if stored in an oily environment
- Do not store near sulfur-containing materials — sulfur staining on rod surfaces introduces sulfide inclusions
- The 3-piece box (3 rods) is sufficient for small repair jobs. For production magnesium repair operations, Harris offers larger box quantities
- Class D fire extinguisher should be accessible when handling magnesium rod and performing magnesium TIG welding
See also Harris AZ92A 1/8 in TIG Rod and Harris AZ61A Magnesium TIG Rod for other magnesium filler options. WeldingMart is an authorized Harris Products Group distributor.
Harris AZ92T50 provides AZ92A magnesium TIG welding rod at 3/32 in x 36 in in a 3-piece box — the smaller diameter in the Harris AZ92A range, intended for thin-wall magnesium castings, precision aerospace components, and fine-detail repair work where 1/8 in rod deposits too much heat per pass. The AZ92A alloy chemistry (9% Al, 2% Zn, balance Mg) provides the highest room-temperature strength in the AZ magnesium alloy system, making it the standard filler for automotive and aerospace casting repair.
Both 3/32 in and 1/8 in AZ92A TIG rod weld the same base metal alloys. Diameter selection depends on:
| Criterion | 3/32 in (AZ92T50) | 1/8 in (AZ92T60) |
|---|---|---|
| Base Metal Thickness | < 3/16 in wall | > 3/16 in wall |
| Amperage Range | 60–110 A | 90–150 A |
| Joint Type | Thin-wall casting, fine cracks | Thick sections, structural joints |
| Filler Deposition | Lower — precise bead control | Higher — faster fill on deep joints |
| Typical Application | Aerospace components, instrument housings | Transmission cases, heavy engine parts |
For the majority of automotive magnesium casting repair (transmission covers, bellhousings, engine cases), 1/8 in AZ92A is more productive. For aerospace sheet and thin-wall structural castings where bead size must be minimized, 3/32 in is the correct choice. Both require AC TIG process, 100% argon shielding, and preheat per casting thickness.
Before welding, confirm the base metal alloy. Common magnesium casting alloys and their compatible fillers:
- AZ91 (die casting alloy, 9% Al, 1% Zn): Most common automotive die-cast magnesium. Weld with AZ92A filler — closest chemistry match. AZ61A is acceptable but slightly under-alloyed.
- AZ92A (high-strength casting, 9% Al, 2% Zn): Match-weld with AZ92A filler. Used in aircraft, high-performance automotive, and aerospace structural castings.
- AZ31 (wrought sheet/extrusion alloy, 3% Al, 1% Zn): Use AZ61A filler for a balanced chemistry between filler and base. AZ92A is acceptable but slightly over-alloyed.
- AZ61 (extrusion alloy, 6% Al, 1% Zn): Use AZ61A filler. Good weldability; used in structural extrusions.
- Unknown alloy: Default to AZ92A filler for die-cast automotive parts; AZ61A for wrought (sheet/tube/extrusion) parts.
Magnesium TIG rod requires no special storage beyond a clean, dry location. Unlike aluminum TIG rod, which oxidizes rapidly to a thick hygroscopic oxide, magnesium oxide forms more slowly and does not significantly affect weld quality if the surface discoloration is minor. However:
- Degrease rod with acetone before use if stored in an oily environment
- Do not store near sulfur-containing materials — sulfur staining on rod surfaces introduces sulfide inclusions
- The 3-piece box (3 rods) is sufficient for small repair jobs. For production magnesium repair operations, Harris offers larger box quantities
- Class D fire extinguisher should be accessible when handling magnesium rod and performing magnesium TIG welding
See also Harris AZ92A 1/8 in TIG Rod and Harris AZ61A Magnesium TIG Rod for other magnesium filler options. WeldingMart is an authorized Harris Products Group distributor.
The most common application for AZ92A TIG rod is repair welding of AZ91 and AZ92A magnesium castings used in automotive transmission housings, engine sumps, and instrument panels. Magnesium die casting alloy AZ91 is one of the most common application base metals in the automotive sector — its wide use in gearbox cases, bellhousings, and structural brackets means AZ92A TIG rod is a maintenance staple in automotive and heavy equipment repair shops. For fabricating new magnesium structures (aerospace skin panels, vehicle rollcages), AZ92A filler provides matching chemistry for high-strength casting alloys.
Maintenance welding of magnesium castings differs from structural fabricating in its repair orientation — the goal is restoring original dimensions and strength, not building new joints. Typical applications in maintenance include: filling porosity defects in die castings, repairing cracks in transmission cases, rebuilding worn mounting bosses on engine components, and sealing casting defects discovered during machining. Similar compositions of magnesium alloys (AZ91, AZ92A, AZ63) all respond well to AZ92A filler with proper preheat and slow cooling procedure.
Many similar compositions of magnesium casting alloys exist in the AZ series; the welding alloy selection (AZ92A vs. AZ61A) depends on the base metal aluminum level. For most automotive die-cast AZ91 repair, AZ92A is the preferred filler for the closest chemistry match. Gases used in AZ92A TIG welding must be 100% argon — helium additions increase arc energy but can cause burn-through on thin-wall castings and are generally not required for most common application scenarios. Typical applications include foundry repair, OEM casting rework, and custom magnesium fabricating in aerospace and motorsport.
The 3 32 in (3/32 in) diameter of Harris AZ92T50 is the smaller of the two AZ92A rod sizes at WeldingMart — the 1/8 in version (AZ92T60) is the higher-deposition option for thicker castings. Both 3 32 and 1/8 in rods use the same AZ92A alloy chemistry and the same process parameters, differing only in amperage range and bead size. For thin-wall castings where the 1/8 in rod deposits too much heat, the 3 32 in size is the solution. Both sizes in 3 32 and 1/8 are available at WeldingMart; compare the two sizes to find the right option for your specific joining application.
Shielding gases for AZ92A TIG welding include only 100% argon — no helium, no mixed gases are standard. Different magnesium alloys and different section thicknesses respond similarly to the 100% Ar shielding gas recommendation. For most magnesium alloys in the AZ series, 100% Ar at 15–25 CFH is the specification. A common solution question: can you MIG weld magnesium? Joining magnesium by MIG is possible but rare in practice — most magnesium welding is done by TIG. The MIG process produces more spatter and less precise heat control than TIG for magnesium. Fabricators joining magnesium in production settings use automated TIG with pulsed AC, not MIG. The gases used in AZ92A TIG welding are purely argon — no CO₂, no nitrogen, no helium additions are needed for most magnesium alloys. Find the right rod size for your application by checking the parameter table in Section 3: most common application scenarios are covered including thin-wall casting, structural extrusion joining, and repair welding.
AZ92A magnesium TIG welding rod finds wide use in aerospace, automotive, and industrial maintenance because it covers the most common die-cast and permanent-mold magnesium casting alloys. The WeldingMart website protects your purchase through secure checkout — the site security verifies orders and bot-free processing protects customer information when you add AZ92A rod to cart. The website displayed product information for AZ92T50 verifies: 3/32 in x 36 in, 3-piece box, ERAZ92A classification.
After welding magnesium, a rinse of the joint area with hot water removes any residual magnesium oxide flux or grinding residue that may have settled in the joint. Hot water rinse is not a substitute for argon back purging or proper AC TIG shielding, but it is a useful final cleaning step after grinding and inspection of repair joints. Enough water at moderate temperature (hot but not boiling) dissolves soluble magnesium compounds from the weld area. A broken casting that has been TIG welded with AZ92A rod may require mechanical straightening (if distortion occurred) followed by hot water cleaning before dimensional inspection. The bot-protected checkout on the WeldingMart website waiting page is automated — no manual intervention needed. Flux is not used in magnesium AC TIG welding — the AC arc cleaning action replaces flux by mechanically disrupting the MgO layer on the molten pool. Waiting for delivery: standard shipping applies; contact WeldingMart to verify lead time. Security-verified checkout protects your order. The 3/32 in size finds wide use in precision magnesium repair where 1/8 in wire is too large.