Brazing vs Welding

Melt base metal.
Or just filler.
Very different.

Welding melts base metals together with filler. Brazing melts only a lower-temperature filler which bonds by capillary action. Different process temperatures, joint characteristics, capabilities. Each has a sweet spot.

Get a Quote DFM guide

01 · At a glance

Side-by-side summary.

Option A

Brazing

Filler alloy melts below base metal's melting point (430°C-950°C typical). Capillary action draws filler into joint. Base metal doesn't melt. Joins dissimilar metals, minimal distortion, atmosphere control optional.

Option B

Welding

Base metals melt at interface with added filler. Higher temperatures (1400°C+ for steel). Fully continuous metallurgical bond. Higher joint strength but more distortion, limited dissimilar-metal capability.

02 · Detailed comparison

Feature-by-feature breakdown.

Attribute	Brazing	Welding
Process temperature	430-950°C	1400-3000°C (arc)
Base metal melted?	No	Yes
Filler material	Silver, copper-phosphorus, nickel	Various weld rods/wires
Joint strength	30-70% of base metal	100% of base metal (typical)
Distortion	Minimal	Significant (localized heating)
Dissimilar metals	Excellent (easy)	Difficult or impossible
Joint gap tolerance	0.05-0.2 mm ideal	Can fill large gaps
Skill required	Moderate	High
Equipment cost	Low-moderate	Moderate-high
Heat damage to base	Minimal	Heat-affected zone significant
Typical appearance	Smooth fillets	Weld beads visible
Typical applications	Heat exchangers, bike frames, jewelry	Structural, pressure vessels, heavy assembly

03 · Decision guide

When to choose each.

Choose Brazing when:

Dissimilar metals (copper to steel)
Heat-sensitive components
Precision assemblies (minimal distortion)
Electronic assemblies
Heat exchangers (copper, stainless)
Bicycle frames (traditional lugged construction)

Choose Welding when:

Structural applications requiring full strength
Pressure vessels (ASME IX requires welding)
Large assemblies
Thick materials
Aerospace primary structure
Heavy industrial equipment

FAQ

Common questions.

Welded joint has continuous metallurgical bond — essentially same material as base metal. Brazed joint has filler alloy bond between base metals — the filler is different from base, typically lower strength. Brazed joint strength is filler strength (often 30-70% of base metal). For critical structural, welding needed. For assemblies where joint loading is manageable, brazing is adequate.

Brazing excels at dissimilar metals — copper to steel, stainless to aluminum, ceramic to metal. Filler alloy bridges the metallurgical incompatibility. Welding dissimilar metals creates intermetallic compounds at interface — often brittle. Possible with specific filler alloys and techniques but difficult. For most dissimilar joining, brazing is the right answer.

Silver brazing alloys: silver + copper + other metals. Lower melting (600-800°C), cleaner joints, higher cost. Standard for precision work, jewelry, food equipment. Copper brazing: copper or copper-phosphorus filler. Higher melting (700-900°C), cheaper, good for steel-to-steel. Standard for HVAC piping, automotive, general industrial. Specific alloy choice depends on base metals and application.

Furnace brazing in vacuum or inert atmosphere (hydrogen, argon): prevents oxidation during heating, produces cleaner joints, higher quality. Standard for aerospace, medical, high-reliability applications. Alternative: torch brazing with flux to dissolve oxides. Flux works but leaves residue requiring cleaning. For best quality, controlled atmosphere brazing.

Joint gap matters for brazing — capillary action requires 0.05-0.2 mm gap. Too tight: filler can't flow in. Too loose: filler won't fill gap. Design fixtures to maintain gap during heating. Common joints: lap joint (overlap area, good strength), butt joint (limited area, weak), scarf joint (angled mating for strength). Our brazing work includes joint design review during DFM.

For simple single joints: welding typically cheaper per joint. For complex assemblies with many joints: brazing often economical because multiple joints complete simultaneously in furnace. For dissimilar metals: brazing essentially required. For production quantities, brazing allows automation (fixturing, furnace processing). Trade-off based on geometry, volume, material combinations.