Key principles.
Per load
Butt joint: tensile strongest. Lap joint: easy to fit. T-joint: structural. Choose per loading.
For thickness
Square edges < 3 mm. V-groove 3-20 mm. Double-V > 15 mm. Per material thickness.
Tool path
Welder must reach joint. Access dimensions: 50 mm minimum tool clearance.
Match where possible
Welded sheets ideally same thickness. Mismatch causes thermal/strength mismatch.
Symmetric welds
Symmetric weld sequences balance heat distortion. Pre-fixturing helps.
Stack-up included
Welded assemblies typically need post-weld machining for precision features. Plan in DFM.
FAQ
AWS D1.1: structural steel. AWS D1.2: aluminum. ASME IX: pressure vessels. Choose per application.
TIG: precision, slower, aerospace standard. MIG: production, faster, general industrial. Cost: TIG 2× MIG hourly.
Match base metal grade. ER70S-6 standard mild steel. ER308L for 304 stainless. ER316L for 316L. ER4043 for general aluminum.
Significant for thin material. Pre-fixturing, sequence, symmetric welds, post-weld machining all manage distortion.
HAZ extends 5-15 mm from weld typically. Material properties altered. Plan precision features away from HAZ.
Visual standard. PT or MT for surface cracks. RT or UT for internal flaws. Per applicable code.
Get an instant quote
Send your CAD — we reply with detailed pricing, lead time, and DFM feedback within 4 working hours.
Talk to an engineer
WhatsApp our team directly. Most messages answered within 12 minutes during work hours.
Explore all services
CNC, 3D printing, injection molding, sheet metal, casting, finishing — one quality system, one partner.
Working on a live project? Send the STEP file and the two or three features you are unsure about — an engineer replies with DFM notes and a price, usually within four working hours.
