| name | metalworking-intro |
| description | Comprehensive introductory guide to metalworking covering welding types including MIG, TIG, and stick, essential safety equipment, basic fabrication techniques, cutting and grinding tools, metal types and properties, project ideas, and shop setup requirements. Use when the user asks about metalworking intro or needs help with related topics. Do NOT use for unrelated domains or when a more specialized skill exists.
|
| license | Apache-2.0 |
| metadata | {"author":"foundry-skills","version":"1.0.0","tags":"guide step-by-step beginner-friendly","category":"hobbies-crafts","subcategory":"making-building","depends":"","disclaimer":"none","difficulty":"intermediate"} |
Metalworking Intro
When to Use
Process
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Gather requirements. Ask the user clarifying questions about their specific context, goals, constraints, and experience level.
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Analyze the situation. Review the information provided and identify key factors, challenges, and opportunities relevant to metalworking intro.
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Develop the framework. Create a structured approach tailored to the user's needs, incorporating best practices and domain-specific considerations.
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Deliver actionable output. Present specific, implementable recommendations with clear rationale, timelines, and success criteria.
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Address edge cases. Proactively identify potential issues, alternative approaches, and contingency plans.
Use this skill when:
- User needs guidance on metalworking intro
- User asks about metalworking intro best practices or techniques
- User wants a structured approach to metalworking intro
Do NOT use this skill when:
- A more specialized skill exists for the specific subtopic
- The request is outside the scope of metalworking intro
Questions to Ask First
Before providing guidance, establish the metalworker's situation:
- What type of metalwork interests you? (Welding, fabrication, blacksmithing, machining)
- What is your experience level?
- What projects do you want to build?
- What is your budget for equipment?
- What is your workspace? (Garage, outdoor, dedicated shop)
- Do you have electrical service for welding? (120V vs. 240V)
- What metals will you work with? (Mild steel, stainless, aluminum)
- Do you have any safety training?
- What tools do you currently own?
- Are you interested in hobby or professional metalwork?
Welding Types
Welding Process Comparison
| MIG (GMAW) | TIG (GTAW) | STICK (SMAW)
--------------|----------------|-----------------|----------------
Difficulty | Easiest | Hardest | Moderate
Speed | Fast | Slow | Moderate
Appearance | Good | Excellent | Rough (needs grinding)
Metals | Steel, stainless,| All metals | Steel, stainless,
| aluminum | | cast iron
Thickness | Thin to medium | Thin to medium | Medium to thick
Portability | Low (gas tank) | Low (gas tank) | High (no gas needed)
Outdoor use | Poor (wind) | Poor (wind) | Excellent
Cost to start | $400-$1,500 | $500-$2,000 | $200-$800
Best for | Beginners, fab | Precision, thin,| Outdoor, structural
| work, auto | artistic | repair, heavy steel
CHOOSE MIG IF:
- You're a beginner wanting the fastest learning curve
- You work mostly with mild steel
- You want speed and efficiency
- You do automotive or fabrication work
CHOOSE TIG IF:
- You want the best-looking welds
- You work with thin materials or exotic metals
- You value precision over speed
- You're building art, furniture, or bikes
CHOOSE STICK IF:
- You work outdoors frequently
- You weld thick structural steel
- Budget is limited
- You need portability
- You're doing farm/ranch repairs
MIG Welding Basics
EQUIPMENT:
MIG welder (140A for hobby, 200A+ for serious work)
Shielding gas: 75% Argon / 25% CO2 (C25) for steel
100% Argon for aluminum
Wire: ER70S-6 (0.030" for thin, 0.035" for thicker steel)
Contact tips, nozzle, liner (consumables)
SETTINGS GUIDE (Mild Steel):
Material | Wire Size | Voltage | Wire Speed | Gas Flow
------------|-----------|---------|------------|----------
18 gauge | .030" | 17-18V | 180-220 IPM| 20 CFH
16 gauge | .030" | 18-19V | 220-280 IPM| 20 CFH
14 gauge | .030" | 19-20V | 280-350 IPM| 25 CFH
3/16" | .035" | 20-22V | 300-400 IPM| 25 CFH
1/4" | .035" | 22-24V | 350-450 IPM| 25 CFH
TECHNIQUE:
- Push angle: 5-15 degrees from vertical (push for flat, less spatter)
- Travel speed: Consistent, watch the puddle not the arc
- Stick-out: 3/8" to 1/2" wire extension from contact tip
- Gun-to-work distance: 3/8" to 1/2"
- Overlap passes by 30-50% for multi-pass welds
- Listen: Good weld sounds like frying bacon, not popping or crackling
COMMON MIG PROBLEMS:
Problem | Cause | Fix
----------------|------------------------|---------------------------
Porosity | Wind, dirty metal, gas | Shield from wind, clean, check gas
Spatter | Voltage too high/low | Adjust voltage, check ground
Burn-through | Too much heat | Reduce settings, move faster
Lack of fusion | Too cold, too fast | Increase settings, slow down
Bird-nesting | Wire feed issue | Check liner, tension, tip
TIG Welding Basics
EQUIPMENT:
TIG welder with HF start (AC/DC for aluminum capability)
Tungsten electrodes: 2% Lanthanated (general purpose, gray band)
Shielding gas: 100% Argon (15-20 CFH)
Filler rod: ER70S-2 (steel), ER308L (stainless), ER4043 (aluminum)
Foot pedal or fingertip control for amperage
TECHNIQUE:
- Hold torch at 15-20 degree angle from vertical
- Point tungsten in direction of travel
- Maintain 1/8" arc length (tungsten to work distance)
- Dab filler rod into the leading edge of the puddle
- Coordinate both hands: torch moves, filler dabs
- For thin material: Dab-move-dab-move rhythm
- Use foot pedal to control heat in real-time
TUNGSTEN PREPARATION:
DC (steel, stainless): Grind to a sharp point (grind lengthwise, not across)
AC (aluminum): Sharpen to a point, will form a ball during welding
Never dip tungsten into the puddle (contamination = poor weld)
If contaminated: Regrind past the contaminated area
AC vs DC:
DC Negative (DCEN): Steel, stainless, chromoly, copper
AC: Aluminum, magnesium (AC provides oxide cleaning action)
Stick Welding Basics
EQUIPMENT:
Stick welder (minimum 150A for general purpose)
Electrodes (rods):
6013: Easy to use, general purpose, thin to medium
6011: All-position, deep penetration, dirty metal OK
7018: Strongest, smoothest, flat/horizontal only
7014: Easy arc, smooth bead, flat/horizontal
TECHNIQUE:
- Strike arc like lighting a match (drag start)
- Maintain 1/8" arc length (electrode to work)
- Travel angle: 5-15 degrees drag angle
- Listen for consistent crackling sound
- Watch the puddle, not the arc (wear proper shade)
- Chip slag between passes (ALWAYS wear safety glasses for chipping)
AMPERAGE GUIDE:
Electrode diameter x 1000 = starting amperage (very rough)
3/32" (2.4mm): 60-90A
1/8" (3.2mm): 90-130A
5/32" (4.0mm): 120-160A
Adjust based on material thickness and position
Safety Equipment
Required Personal Protective Equipment
WELDING HELMET:
Auto-darkening (shade 9-13, adjustable)
Shade 10: TIG on thin material
Shade 11-12: MIG, general welding
Shade 13: Stick welding, high amperage
Budget: Lincoln Viking, Hobart, $80-$200
Premium: Miller Digital Infinity, $250-$400
WARNING: Never look at an arc without proper eye protection.
Even brief exposure causes arc eye (painful cornea burn).
Bystanders need minimum shade 5 safety glasses.
GLOVES:
MIG: Medium-weight leather gloves (dexterity + protection)
TIG: Thin leather gloves (maximum dexterity needed)
Stick: Heavy leather gauntlet gloves
Grinding: Leather work gloves (NOT welding gloves)
CLOTHING:
[ ] 100% cotton or leather - NEVER synthetic (melts onto skin)
[ ] Long sleeves (leather jacket or welding jacket preferred)
[ ] Leather boots (steel toe recommended, no laces near sparks)
[ ] Leather apron (for heavy grinding or overhead welding)
[ ] Welding cap or bandana (protects head from sparks and UV)
[ ] Button shirt collars (not open neck that catches sparks)
[ ] No cuffs on pants (catch sparks)
RESPIRATORY:
Welding fume respirator: 3M 6000 series with P100/OV cartridges
Minimum: N95 mask for light grinding
Ventilation: Exhaust fan or fume extractor at welding station
WARNING: Welding fumes from galvanized steel, stainless steel,
and certain metals are extremely toxic. ALWAYS ventilate.
HEARING:
Grinding and cutting generate significant noise
Ear plugs or over-ear protection when grinding
FIRE SAFETY:
[ ] Fire extinguisher (ABC type) within arm's reach
[ ] Welding blanket to protect surroundings from sparks
[ ] Clear area of flammables (10 ft minimum from welding)
[ ] Check for fire 30 minutes after welding/grinding
[ ] Fire watch when welding near combustibles
Basic Fabrication Techniques
Layout and Measuring
TOOLS:
Tape measure (metal case, 25 ft)
Combination square (check 90 degrees and 45 degrees)
Soapstone or silver streak marker
Scribe (for precision marking on metal)
Center punch (mark drill locations)
Angle finder / protractor
Straight edge (36" or longer)
MEASURING RULES:
1. Measure twice, cut once (measure three times if expensive)
2. Always reference from the same edge
3. Use a scribe for precision, soapstone for visibility
4. Center punch all drill locations before drilling
5. Account for kerf (material removed by cutting tool)
6. Mark waste side with X to avoid cutting wrong piece
Cutting Tools
ANGLE GRINDER (Most Versatile Tool):
Sizes: 4.5" (most common for hobby), 7" or 9" for heavy work
Discs:
Cut-off disc (1mm): Cutting metal
Grinding disc (6mm): Removing material, beveling
Flap disc (40-120 grit): Smoothing, blending, finishing
Wire wheel: Cleaning rust and paint
BAND SAW (Horizontal):
Best for: Straight cuts on bar stock, tube, angle
Accurate, clean cuts with minimal material waste
CHOP SAW (ABRASIVE CUT-OFF):
Fast cuts on steel
Less precise than band saw
Generates sparks and noise (full PPE required)
PLASMA CUTTER:
Best for: Freehand cutting, curved cuts, sheet metal
Clean cuts, minimal heat-affected zone
Cost: $400-$1,500 for hobby-level
Requires compressed air (30-60 CFH at 60-80 PSI)
OXY-ACETYLENE TORCH:
Cutting, heating, brazing, welding (multi-purpose)
Thicker steel capability than plasma
Also used for bending and heat treatment
Cost: $300-$500 for tank set and torch kit
Ongoing cost: Tank refills
HAND TOOLS:
Hacksaw: Slow but precise, no electricity needed
Tin snips: Sheet metal up to 18 gauge
Bolt cutters: Rod and small stock
Metal Types and Properties
MILD STEEL (A36, 1018):
Most common, easiest to weld, affordable
Magnetic, rusts without coating
Available as: Sheet, plate, tube, angle, flat bar, round bar
Finish: Paint, powder coat, galvanize, or oil/wax
STAINLESS STEEL (304, 316):
Corrosion resistant, more expensive
Harder to weld (use 308L filler, 316L for 316)
Use: Food equipment, outdoor furniture, architectural
Heat management critical (distorts easily)
ALUMINUM (6061, 5052):
Lightweight, corrosion resistant
Requires AC TIG or spool gun on MIG
Different filler rods than steel
Cannot be as easily bent or forged
Use: Lightweight structures, marine, automotive
CHROMOLY (4130):
High strength-to-weight ratio
Weldable with proper technique and filler (ER80S-D2 or ER70S-2)
Use: Roll cages, bicycle frames, aircraft
Requires post-weld stress relief for critical applications
CAST IRON:
Weldable with special rods (nickel-based)
Must pre-heat and cool slowly
Very brittle
Use: Repair of castings, engine blocks, antique restoration
Project Ideas
Beginner Projects
1. PRACTICE WELDS ON SCRAP
Material: Mild steel plate and scraps
Skills: Running beads, flat position, butt joints, T-joints
2. SIMPLE BRACKET OR SHELF SUPPORT
Material: Flat bar, angle iron
Skills: Layout, cutting, 90-degree welding
3. FIREWOOD RACK
Material: Square tube (1"x1" or 1.5"x1.5")
Skills: Square cuts, assembly, basic fab
4. WELDING TABLE
Material: Square tube frame, steel plate top
Skills: Square frame construction, leveling
5. BOTTLE OPENER
Material: Flat bar, railroad spike, or rebar
Skills: Grinding, shaping, simple forge work (optional)
Intermediate Projects
6. STEEL WORKBENCH
Material: Square tube, angle iron, sheet metal
Skills: Complex layout, multiple joints, leveling
7. TRAILER HITCH ACCESSORIES
Material: Plate, tube, flat bar
Skills: Load-bearing welds, precision fitting
8. FIRE PIT
Material: Sheet steel or steel ring
Skills: Cutting curves, bending, decorative work
9. STEEL FURNITURE (Table, Chair, Shelf)
Material: Square and round tube, flat bar
Skills: Grinding, finishing, mixed materials (wood/metal)
10. GATE OR FENCE PANEL
Material: Square tube, flat bar, round bar
Skills: Layout, repetitive accurate fabrication
Shop Setup
Minimum Shop Requirements
SPACE:
Minimum: 10x12 ft (garage bay)
Ideal: 20x20 ft or larger
Requirements:
[ ] Concrete floor (not wood - fire hazard)
[ ] Ventilation (exhaust fan minimum, open door)
[ ] Fire-resistant walls or welding screens
[ ] Adequate lighting
[ ] Power: 120V minimum (240V for serious welding)
ELECTRICAL:
MIG 140A: 120V / 20A circuit
MIG 200A+: 240V / 30-50A circuit
TIG: 240V / 50A circuit (most machines)
Angle grinder: 120V / 15A circuit
Consider dedicated circuits for welders (no shared circuits)
ESSENTIAL SHOP EQUIPMENT:
[ ] Welding table (steel top, grounded)
[ ] Vise (4" minimum jaw, bolted to bench)
[ ] Angle grinder (4.5")
[ ] Clamps: Welding C-clamps, locking pliers, bar clamps
[ ] Welding magnets (hold pieces at 45/90 degrees)
[ ] Wire brush (stainless for stainless steel)
[ ] Chipping hammer (for stick welding slag)
[ ] Fire extinguisher (ABC type, easily accessible)
[ ] First aid kit (with burn gel)
NICE TO HAVE:
[ ] Drill press
[ ] Horizontal band saw
[ ] Bench grinder
[ ] Belt sander
[ ] Plasma cutter
[ ] Metal brake (sheet bending)
[ ] English wheel (shaping sheet metal)
Common Mistakes to Avoid
- Welding on dirty, rusty, or painted metal (clean to bare metal first)
- Wearing synthetic clothing that can melt onto your skin
- Welding galvanized steel without extreme ventilation (zinc fumes are toxic)
- Not wearing proper eye protection for EVERY operation (welding AND grinding)
- Skipping tack welds and trying to weld a full seam on unfixed parts (warping)
- Grinding without a face shield (grinding discs can shatter)
- Welding too fast (not getting proper fusion/penetration)
- Not checking for square before welding (distortion pulls things out of alignment)
- Ignoring fire safety (sparks travel far; check the area 30 minutes after welding)
- Underestimating the cost of consumables (gas, wire, discs, electrodes add up)
Output Format
Deliver the response as a structured document with clear headings and actionable content. Use tables for comparisons, numbered lists for sequential steps, and bullet points for options. Include specific examples where applicable.
[Metalworking Intro deliverable]
1. Context and objectives
2. Analysis or framework
3. Specific recommendations with rationale
4. Action items with timeline
Example
Input: "Help me with metalworking intro for a mid-size project."
Output: A complete metalworking intro framework tailored to the specific context, with actionable steps, relevant considerations, and measurable outcomes.
Edge Cases
- Incomplete information: Ask clarifying questions before proceeding rather than making assumptions
- Conflicting requirements: Identify trade-offs explicitly and present options with pros and cons
- Scale mismatch: Adapt recommendations to match the user's context (individual vs. team vs. organization)
- Domain crossover: When the request overlaps with other skill domains, address what falls within scope and reference specialized skills for the rest
