Magnesium Alloy AWS BMg-1
UNS M19001 · AISI/SAE AWS A5.19 BMg-1
AWS BMg-1 is a magnesium welding and brazing filler of AZ61A composition (UNS M19001) standardised in AWS A5.19 as rod, wire and spooled electrode.
Reference datasheet — AWS BMg-1 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the AS-BRAZED condition
AWS BMg-1 tempers and conditions
AWS BMg-1 is supplied in 3 conditions, soft to hard. AS-BRAZED is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AS-BRAZEDDefault filler deposited in a brazed joint (600–620 °C) | Default condition: properties of the solidified BMg-1 fillet/joint after torch, furnace or dip brazing of AZ31B/AZ61A/M1A/AZ92A parts. | 95 | 165 | 3 | 63 HB | 10.5 % IACS |
GTAW/GMAW deposit using BMg-1 rod or wire | Pick when the rod is used as an arc-welding filler for repairing cast or wrought magnesium; deposit is stronger and slightly more ductile than the brazed fillet. | 110 | 200 | 4 | 65 HB | 10 % IACS |
As fabricated | Condition in which the consumable itself is supplied (extruded/drawn rod 1.6–4.8 mm or spooled wire); mechanical values apply to the stock, not to a joint. | 140 | 230 | 6 | 68 HB | 11 % IACS |
What is AWS BMg-1?
AWS BMg-1 is a magnesium welding and brazing filler of AZ61A composition (UNS M19001) standardised in AWS A5.19 as rod, wire and spooled electrode. It is used to weld and repair wrought and cast Mg-Al-Zn alloys such as AZ31B, AZ61A and AZ92A, where its higher aluminium and zinc content widens the freezing range and reduces hot-cracking sensitivity. Deposited or as-welded properties are about 95 MPa yield, 165 MPa tensile, 3% elongation and 63 HB, with service limited to roughly 120 °C and very low bare corrosion resistance (12). It is a consumable, not a structural product form; AZ92A filler is the alternative for higher-strength castings. AWS BMg-1 has a density of 1.82 g/cm³ (0.0658 lb/in³), heavier than 74% of magnesium alloy grades. It melts at 443°C (829 °F). AWS BMg-1 has a yield strength of 95 MPa (13.8 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 93% of magnesium alloy grades. Elongation at break is 3% and the elastic modulus is 45 GPa (6.53 Msi).
What is AWS BMg-1 used for?
- GTAW and GMAW filler for magnesium structures
- Repair welding of magnesium castings
- Welding AZ31B sheet and extrusion fabrications
- Torch and furnace brazing of magnesium assemblies
- Build-up of worn or mis-machined Mg castings
- Weld repair of magnesium tooling and fixtures
Limitations
- Hard to polish — 40/100, worse than 100% of magnesium alloy grades
- Needs corrosion protection — 12/100, worse than 98% of magnesium alloy grades
- Low electrical conductivity — 10.5 % IACS, worse than 97% of magnesium alloy grades
- Low strength — 95 MPa (13.8 ksi), worse than 93% of magnesium alloy grades
- Limited ductility — 3%, worse than 85% of magnesium alloy grades
AWS BMg-1 properties
Typical room-temperature values for AWS BMg-1-AS-BRAZED; bars are the position among magnesium alloy grades.
Physical3
AWS BMg-1 has a density of 1.82 g/cm³ (0.0658 lb/in³), heavier than 74% of magnesium alloy grades. It melts at 443°C (829 °F).
Mechanical14
AWS BMg-1 has a yield strength of 95 MPa (13.8 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 93% of magnesium alloy grades. Elongation at break is 3% and the elastic modulus is 45 GPa (6.53 Msi).
Thermal6
AWS BMg-1 is rated for continuous service to 120°C (248 °F). It conducts heat at 68 W/m·K (39.3 BTU/hr·ft·°F), worse than 81% of magnesium alloy grades. Thermal expansion is 26 µm/m·K (14.4 µin/in·°F).
Electrical3
AWS BMg-1 conducts electricity at 10.5 % IACS, worse than 97% of magnesium alloy grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 98% of magnesium alloy grades.
Sustainability4
Producing a kilogram of AWS BMg-1 takes about 320 MJ of energy and emits 30 kg of CO₂ — less than 74% of magnesium alloy grades. Typical recycled content is 10%.
Manufacturability8
AWS BMg-1's machinability is excellent (92/100, worse than 86% of magnesium alloy grades); weldability good (65/100); formability poor (20/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the magnesium alloy family
Yield strength against density for every magnesium alloy grade FabDigit runs. AWS BMg-1 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with AWS BMg-1
Is AWS BMg-1 easy to machine?
Cuts extremely freely with sharp, high-rake tools and no coolant misting; keep chips dry and away from water — magnesium fines are a fire hazard.
Can AWS BMg-1 be welded?
Use as GTAW/GMAW filler on AZ31B/AZ61A/AZ92A with pure Ar or Ar-He shielding, tight fit-up and low heat input to avoid hot cracking; braze at 600–620 °C where the base-metal solidus allows only ~20–30 °C of margin.
Can AWS BMg-1 be formed, bent or molded?
Supplied straightened or spooled; bend or coil warm (150–250 °C) since cold formability of Mg-9Al-2Zn is limited.
AWS BMg-1 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Alprincipal melting-point depressant | 8.3 – 9.7 | 9 |
| Zn | 1.7 – 2.3 | 2 |
| Mncorrosion control | 0.15 – 1 | 0.25 |
| Beoxidation inhibitor; observe fume-toxicity precautions | 2×10⁻⁴ – 8×10⁻⁴ | 5×10⁻⁴ |
| Si | ≤ 0.05 | |
| Cu | ≤ 0.05 | |
| Ni | ≤ 0.01 | |
| Fe | ≤ 0.01 | |
| Other, totalresiduals, each ≤0.05 typical | ≤ 0.3 | |
| Mg | balance |
What surface finishes work on AWS BMg-1?
Remove all chloride/fluoride flux by hot-water and dilute chromic/nitric acid rinsing, then apply a conversion coating (ASTM D1732) plus epoxy primer; leaving flux residue guarantees rapid joint corrosion.
Equivalent designations
Standards and trade names that resolve to Magnesium Alloy AWS BMg-1 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- M19001
- AISI / SAE
- AWS A5.19 BMg-1
- Also called
- AZ61A composition
How much does AWS BMg-1 cost?
AWS BMg-1 is a high-cost magnesium alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
AWS BMg-1 — frequently asked
What is AWS BMg-1 used for?
AWS BMg-1 is typically used for GTAW and GMAW filler for magnesium structures, repair welding of magnesium castings, welding AZ31B sheet and extrusion fabrications, torch and furnace brazing of magnesium assemblies, build-up of worn or mis-machined Mg castings and weld repair of magnesium tooling and fixtures. In short: AZ61A-composition magnesium filler; welds and brazes magnesium; consumable, not structural stock.
What is the yield strength of AWS BMg-1?
AWS BMg-1 has a typical yield strength of 95 MPa (13.8 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 93% of magnesium alloy grades. Strength varies by condition: see the 3 listed tempers.
Is AWS BMg-1 easy to machine?
Yes — machinability is rated excellent (92/100, worse than 86% of magnesium alloy grades). Cuts extremely freely with sharp, high-rake tools and no coolant misting; keep chips dry and away from water — magnesium fines are a fire hazard.
Can AWS BMg-1 be welded?
Yes — weldability is rated good (65/100). Use as GTAW/GMAW filler on AZ31B/AZ61A/AZ92A with pure Ar or Ar-He shielding, tight fit-up and low heat input to avoid hot cracking; braze at 600–620 °C where the base-metal solidus allows only ~20–30 °C of margin.
What surface finishes work on AWS BMg-1?
Remove all chloride/fluoride flux by hot-water and dilute chromic/nitric acid rinsing, then apply a conversion coating (ASTM D1732) plus epoxy primer; leaving flux residue guarantees rapid joint corrosion.
Can AWS BMg-1 be formed, bent or molded?
Supplied straightened or spooled; bend or coil warm (150–250 °C) since cold formability of Mg-9Al-2Zn is limited.
What is the maximum service temperature of AWS BMg-1?
AWS BMg-1 is rated for continuous use to about 120°C (248 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between AWS BMg-1 AS-BRAZED and AWS BMg-1-F?
AS-BRAZED is the default condition — default condition: properties of the solidified BMg-1 fillet/joint after torch, furnace or dip brazing of AZ31B/AZ61A/M1A/AZ92A parts. F: condition in which the consumable itself is supplied (extruded/drawn rod 1.6–4.8 mm or spooled wire); mechanical values apply to the stock, not to a joint. Yield strength is 95 MPa in AS-BRAZED versus 140 MPa in F.
How much does AWS BMg-1 cost?
AWS BMg-1 is a high-cost magnesium alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- AWS A5.8/A5.8M — Specification for Filler Metals for Brazing and Braze Welding — American Welding Society (2019)
- AWS A5.19 — Specification for Magnesium Alloy Welding Electrodes and Rods — American Welding Society (1992)
- ASM Handbook, Vol. 6 — Welding, Brazing and Soldering (Brazing of Magnesium Alloys) — ASM International (1993)
- ASM Specialty Handbook: Magnesium and Magnesium Alloys — ASM International (1999)
- ASM Handbook, Vol. 2 — Properties and Selection: Nonferrous Alloys (AZ92A data) — ASM International (1990)
- ASTM D1732 — Preparation of Magnesium Alloy Surfaces for Painting — ASTM International (2019)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.