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AI Tools for Sheet Metal Workers
AI tools that help sheet metal workers look up material properties, calculate bend allowances, research welding and joining specifications, find technical standards, and advance their fabrication careers.
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K-Factor
0.33 (standard for air bending)
Inside Radius
0.25 inches
Bend Allowance
0.4319 inches
Bend Deduction
0.2931 inches
Flat Pattern
Blank = Leg 1 + Leg 2 − 0.2931"
Bend allowance and flat pattern calculations
Get accurate bend allowance, K-factor, and flat pattern dimensions for any material, gauge, bend radius, and angle combination. Eliminate costly material waste from miscalculated flat patterns.
I need the bend allowance for a 90-degree bend in 0.090-inch (11 gauge) mild steel with a 3/16-inch inside bend radius. I am using an air-bending press brake. Also give me the bend deduction so I can calculate my flat pattern.
For 11-gauge mild steel (0.090"), 90° air bend, 3/16" (0.1875") inside radius: K-factor for air bending: 0.33 (standard for air bending mild steel). Bend allowance = π/2 × (IR + K×T) = π/2 × (0.1875 + 0.33×0.090) = π/2 × 0.2172 = 0.3415 inches. Bend deduction = 2×(IR + T) − BA = 2×(0.1875 + 0.090) − 0.3415 = 0.5550 − 0.3415 = 0.2135 inches. Flat pattern formula: blank length = leg 1 + leg 2 − bend deduction (0.2135"). Verify your first bend on a test piece — K-factor varies slightly between press brake setups and tooling condition.
ToolRouter research
K-Factor
0.33 (standard for air bending mild steel)
Bend Allowance
0.3415 inches
Bend Deduction
0.2135 inches
Flat Pattern
Blank = Leg 1 + Leg 2 − 0.2135"
Note
Verify on test piece — K-factor varies by tooling condition
Welding and joining specifications
Look up the correct welding procedures, filler metal selection, preheat requirements, and joint design for any sheet metal welding application — MIG, TIG, spot welding, and resistance welding. Get the specification before touching the torch.
What filler metal and welding parameters should I use for TIG welding 0.063-inch 304 stainless steel to 0.090-inch 304 stainless — I need the recommended amperage range, travel speed, filler diameter, and shielding gas for a lap joint.
304 SS TIG welding — thin gauge lap joint: Filler: ER308L (1/16" diameter for this thickness). Amperage: 35–55A for the thinner piece side (0.063"); use foot pedal control to back off to 35A on the thinner piece to avoid burn-through. Shielding gas: 100% Argon at 15–20 CFH. Travel speed: 4–6 inches per minute for full fusion without excessive heat input. Technique: direct heat toward the thicker piece (0.090") and allow heat to flow into the 0.063" piece — prevents blow-through. Back purge: not strictly required for structural lap joints, but recommended if the underside will be exposed to food or corrosives. Interpass temperature: keep below 350°F to avoid sensitization in the heat-affected zone.
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Filler Metal
ER308L — 1/16" diameter for this thickness range
Amperage Range
35–55A · use foot pedal to back off to 35A on 0.063" side
Shielding Gas
100% Argon at 15–20 CFH
Travel Speed
4–6 inches per minute for full fusion
Technique
Direct heat to 0.090" side — prevents blow-through on 0.063"
HVAC ductwork layout and design documentation
Create ductwork layout diagrams for HVAC system design, shop drawing reviews, and installation planning. Visualize trunk-and-branch systems, duct transitions, and equipment connections before fabrication begins.
Create a simple HVAC ductwork system layout diagram for a single-zone commercial space: 18"x12" main trunk from AHU, splitting into 2 branch lines at 12"x8", each branch feeding 3 ceiling diffusers via 8" round duct with flex connectors.
Generated HVAC ductwork layout diagram. Main trunk (18"x12") shown from AHU symbol, running horizontally to center-point split. Branch 1 (left): 12"x8" rectangular duct transitioning to 3 drops — 8" round spiral to each ceiling diffuser, with flex connector noted at each diffuser connection. Branch 2 (right): mirror layout. Duct sizes labeled at each section, AHU labeled at source, diffuser symbols at endpoints. Transition fitting symbols at each rectangular-to-round change. Diagram is suitable for shop fabrication planning or subcontractor coordination.
ToolRouter render_diagram
Main Trunk
18"×12" from AHU · runs to center split point
Branch 1 (left)
12"×8" rect → 3× 8" round drops to ceiling diffusers
Branch 2 (right)
12"×8" rect → 3× 8" round drops to ceiling diffusers
Fittings
Rect-to-round transition symbols at each change · flex noted at diffusers
Industry standards and code research
Look up SMACNA ductwork standards, ASHRAE specifications, ASTM material standards, and AWS welding codes that govern your work. Get the critical requirements without purchasing full code documents.
What are the SMACNA duct construction standards for rectangular ductwork at 2-inch water column static pressure? I need the gauge requirements, reinforcement spacing, and joint type for 24-inch wide ductwork.
SMACNA 2" WC rectangular duct — 24" wide: Gauge: minimum 22-gauge galvanized steel at 2" WC. Reinforcement: required at 48" maximum spacing for 24" wide duct at 2" WC — use SMACNA Table 1-7 for specific angle iron size (typically 1"×1"×⅛" at this pressure class). Joints: transverse joints must be reinforced drive-and-cleats or TDC/TDF flange system at 2" WC — slip joints alone are not adequate. Sealing: all joints must be sealed with UL-181 rated mastic or tape for static pressure systems above 1" WC. SMACNA also requires an airtightness test at 2" WC — leakage class C maximum for commercial systems.
ToolRouter research
Minimum Gauge
22-gauge galvanized steel at 2" WC
Reinforcement Spacing
Max 48" spacing — 1"×1"×⅛" angle iron at this pressure class
Joint Type
TDC/TDF flange system required — slip joints not adequate at 2" WC
Sealing
UL-181 rated mastic or tape required — all joints
Airtightness
Leakage class C maximum for commercial systems at 2" WC
Career advancement in sheet metal trades
Research union apprenticeship programs, journeyman certification requirements, HVAC sheet metal specializations, and higher-paying positions in precision fabrication, aerospace, or custom architectural metalwork.
What are the highest-paying specializations for an experienced sheet metal journeyman? I have 7 years in HVAC ductwork and want to know what pivot would give me the most significant pay increase.
Highest-paying sheet metal specializations for journeymen: (1) Aerospace sheet metal (aluminum and titanium structures) — $42–58/hr with aerospace employers (Boeing, Northrop, defense contractors). Requires precision tolerancing skills and blueprint reading for complex assemblies. (2) Architectural metal (facades, cladding, custom millwork) — $38–55/hr for custom shops. Requires layout and pattern development skills. (3) Industrial boilermaking / pressure vessel fabrication — $40–55/hr, requires ASME Section IX welding certifications. (4) Precision enclosure and instrumentation fabrication — $35–48/hr, requires tight tolerance work and CNC press brake programming. Your HVAC background transfers directly to industrial mechanical systems and building envelope work — both pay 25–35% more than HVAC ductwork in most markets.
ToolRouter search_jobs
SpecializationPay rangeKey requirement
Aerospace Sheet Metal$42–58/hrPrecision tolerancing · Boeing/defense
Architectural Metal$38–55/hrLayout · pattern development skills
Industrial Boilermaking$40–55/hrASME Section IX welding cert
Precision Enclosures$35–48/hrCNC press brake programming
HVAC background transfers directly to industrial mechanical and building envelope
ToolRouter research
Aerospace sheet metal
$42–58/hr · requires precision tolerancing skills and blueprint reading
Architectural metal
$38–55/hr · custom shops · pattern development focus
Industrial boilermaking
$40–55/hr · requires ASME Section IX welding certification
Pay increase estimate
Typical 25–35% pay increase over commercial HVAC ductwork rates
Ready-to-use prompts
Bend allowance calculation
Calculate the bend allowance and bend deduction for a [angle]-degree bend in [gauge] [material] with a [inside radius] inside bend radius using [air bending / bottom bending]. Include the K-factor used and the flat pattern formula.
Welding specification lookup
What filler metal, amperage range, and shielding gas should I use for [MIG / TIG / spot] welding [thickness] [material] to [thickness] [material] in a [joint type] joint? Include travel speed and any preheat requirements.
SMACNA standard lookup
What are the SMACNA duct construction requirements for [duct type: rectangular / round / oval] ductwork at [pressure class] static pressure? I need gauge requirements, reinforcement spacing, and joint type for [dimension] wide ductwork.
Ductwork layout diagram
Create an HVAC ductwork layout diagram for [description of system: trunk size, branch count, terminal unit types]. Label duct sizes at each section and show transition fittings, AHU, and terminal unit symbols.
Material gauge reference
Give me the thickness in inches and millimeters for [gauge range] in galvanized steel, aluminum, and stainless steel. Include the allowable tolerance range and weight per square foot for each.
Dissimilar metal joining
What are the best practices for joining [material A] to [material B] in a sheet metal assembly? Include: galvanic corrosion risk, appropriate joining method (welding / rivets / adhesive), and any isolation requirements.
Sheet metal job search
Find sheet metal worker, HVAC fabricator, and precision metal fabrication positions at mechanical contractors and fab shops in [region] paying above [wage]. Filter to union or journeyman-level roles.
Transition fitting layout
Describe the pattern development method for laying out a [rectangular-to-round / offset / reducing] transition fitting connecting [dimensions]. Include the geometric construction steps for developing the flat pattern.
Tools to power your best work
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Fabrication job setup
Research all technical specifications before beginning a new fabrication job.
HVAC system fabrication planning
Plan and document a ductwork system before shop fabrication.
Career transition research
Research higher-paying specializations and the path to reach them.
Frequently Asked Questions
Can AI help me calculate bend allowances and flat pattern dimensions?
Deep Research retrieves bend allowance calculations for any material, gauge, bend angle, inside radius, and bending method (air, bottom, or coining). It provides the K-factor used, bend deduction, and flat pattern formula — giving you the math to verify your own calculations or set up a new material for the first time.
How do I look up welding specifications for sheet metal work?
Deep Research retrieves filler metal recommendations, amperage ranges, shielding gas requirements, and joint preparation details from AWS D1.1, D1.3, and manufacturer welding data for any material and thickness combination. It distinguishes between requirements for structural welds versus cosmetic welds and flagged preheat requirements for critical applications.
How can AI help with HVAC ductwork layout?
Diagram Generator creates HVAC ductwork system layout diagrams from text descriptions — showing trunk lines, branch takeoffs, duct sizes, transition fittings, and terminal unit locations. These are useful for shop fabrication coordination, subcontractor communication, and installation planning.
How do I look up SMACNA duct construction standards?
Deep Research retrieves specific SMACNA requirements for any pressure class, duct size, and construction type — including gauge minimums, reinforcement spacing, joint type requirements, and sealing specifications. This saves time compared to locating and navigating the full SMACNA manuals for each project.
What are the highest-paying career paths for experienced sheet metal workers?
Aerospace sheet metal (aluminum and titanium structural work), architectural metal fabrication, and industrial boilermaking typically pay 25–40% more than commercial HVAC ductwork for journeyman-level skills. Job Search surfaces current openings by region so you can see actual pay ranges and required qualifications for target roles.
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