Different Kinds of Power Tool (SMAW) – Comprehensive Study Notes

Module Overview

  • Quarter 2 – Module 8 (First Edition 2020) of the TLE-IA-SMAW program for Grades 9/10.
  • Focus: “Different Kinds of Power Tool” used in Shielded Metal Arc Welding (SMAW) and allied metal-fabrication tasks.
  • Part of the Alternative Delivery Mode (ADM) materials prepared by the Schools Division of Negros Oriental, Region VII, Philippines.
  • Designed for guided/independent learning; integrates 21st-century skills, safety consciousness, and industry alignment.

Content & Performance Standards

  • Content Standard: Learners study, clarify, and understand different kinds of power tools in the context of SMAW.
  • Performance Standard: Learners independently perform SMAW processes by applying the underlying concepts and safe operation of power tools.
  • Learning Competency (TLE_IAAW9-12GW-Ie-h-8): Identify, classify, and safely use power tools.

Learning Objectives

  • Identify and describe the various power tools relevant to welding and fabrication.
  • Correctly perform laboratory activities with the designated tool.
  • Apply safe-work habits to prevent personal injury and equipment damage.

Key Concepts & Definitions

Power Tools – General Definition

  • A power tool is any mechanical device actuated by an energy source other than human muscle (e.g., electric motor, compressed air, internal-combustion engine).
  • Classified as:
    • Portable/Hand-held: Emphasise mobility & field work (e.g., cordless drill).
    • Stationary/Benchtop: Offer speed, accuracy, repeatability (e.g., table saw, lathe).
  • Why crucial in SMAW:
    • Accelerate joint preparation, beveling, cutting, cleaning, clamping, and finishing.
    • Provide consistency that meets AWS & ASME code tolerances.
    • Reduce welder fatigue—important for bead quality and productivity.

Link to Previous Lecture (AWS Codes)

  • Earlier lessons covered American Welding Society (AWS) codes; power-tool usage must also comply with these standards.
    • Example: Surface preparation specified in AWS D1.1\text{AWS D1.1} for structural steel demands appropriate grinding or cutting tools.
    • Correct variable control (current, polarity, position) often presumes precise joint geometry produced with power tools.

American Welding Society & Related Codes (Quick Recall)

  • AWS D1.1\text{AWS D1.1} – Structural Welding Code: Steel.
  • AWS D1.6\text{AWS D1.6} – Structural Welding Code: Stainless Steel.
  • ASME Section IX\text{ASME Section IX} – Welding & Brazing Qualifications.
  • ISO, CSA, API, BSI, CEN also publish complementary standards; adherence promotes global employability.

Detailed Catalogue of Power Tools

(Arranged by functional family; each bullet = name ➜ description ➜ SMAW relevance ➜ safety tip.)

1 Drilling, Fastening & Impact Tools

  • Cordless Drill
    • Battery-powered; may include hammer mode & clutch.
    • Pre-drills pilot holes for tack-plate installations and fixtures.
    • Recharge properly to avoid cell memory; inspect for cracked casings.
  • Manual Impact Driver
    • Converts hammer blows into high-torque rotation for loosening “frozen” bolts.
    • Ideal for dismantling welded fixtures without rounding fasteners.
  • Hammer Drill / Percussion Drill
    • Adds axial blows while rotating; faster penetration in masonry base plates.
  • Rotary Hammer
    • Piston-driven hammering; accommodates SDS bits & light chiseling.
    • Choose correct mode (drill-only / hammer-drill / hammer-only).
  • Impact Wrench (a.k.a. impact gun, rattle gun)
    • Stores kinetic energy in a rotating mass; high torque for structural bolting.
    • Air or battery variants; wear hearing protection (>90 dB typical).
  • Electric Screwdriver / Power Screwdriver
    • Torque-limiting clutch protects threads of light-gauge sheet-metal assemblies.

2 Cutting & Sawing Tools

  • Rotary Tool (Dremel-type)
    • Miniature collet spindle; accepts cut-off wheels, burrs, polishing tips.
    • Useful for removing small tack welds or dressing tight spots.
  • Jigsaw (Scroll Saw when bench-mounted)
    • Reciprocating blade for curved cuts in sheet metal templates.
  • Reciprocating Saw (Sawzall)
    • Heavy demolition; cuts pipes, structural members during repair work.
  • Circular Saw
    • Toothed blade; straight cuts through lumber for welding jigs, or with abrasive blade for plate.
  • Miter Saw / Chop Saw
    • Pivoting arm for precise angle cuts—key when preparing miters on rectangular tubing before welding.
  • Table Saw (Saw Bench)
    • Stationary, height-adjustable blade; produces square, repeatable cuts in wood fixture bases.
  • Band Saw (listed but not detailed)
    • Continuous loop blade; accurate cutting of irregular metal shapes.
  • Abrasive Saw / Cut-off Saw
    • High-speed wheel; cold-cutting of metal stock with minimal burr formation.

3 Grinding, Shaping & Finishing Tools

  • Angle Grinder (Side Grinder)
    • Versatile for beveling weld-joint edges, slag removal, and polishing.
    • Wheel type must match task: grinding disc, flap wheel, wire cup, cut-off disc.
  • Bench Grinder
    • Dual-wheel stationary unit; sharpens electrodes, chisels, and tooling.
  • Belt Sander / Strip Sander
    • Continuous abrasive belt for shaping wood or deburring metal coupons.
  • Random Orbital Sander
    • Simultaneous spin & orbit prevents swirl marks; prepares surfaces for paint after welds.
  • Disc Sander (Fixed or Handheld)
    • Rigid backing—aggressive stock removal.
  • Lathe Machine
    • Rotates workpiece for turning, facing, threading; fabricates custom shaft or welding mandrels.
    • Ensures concentricity essential for rotating-equipment repairs.

4 Clamping & Work-Holding Devices

  • C-Clamp
    • General-purpose clamp for tacking parts prior to welding.
  • Bar Clamp
    • Long reach; cabinet frames or large plate alignment.
  • Drill Press Vice
    • Secures component on drill-press table; doubles for reaming and tapping.
  • Engineer’s (Machinist’s) Vise
    • Swivel base; robust jaws grip metal during filing or cutoff-wheel operations.

5 Power Generation, Pneumatics & Cleanup

  • Air Compressor
    • Converts mechanical power into stored compressed air.
    • Drives air tools (impact wrenches, pneumatic grinders) & purges lines.
    • Auto cut-in/out keeps pressure between preset P<em>lowP<em>{\text{low}} and P</em>highP</em>{\text{high}} limits.
  • Shop Vac / Vacuum Cleaner (Wet–Dry)
    • Removes metal chips, flux residue; wet mode cleans coolant spills.

6 Miscellaneous & Specialty Tools

  • Chainsaw – rough-cutting of timber cribbing for weld platforms.
  • Biscuit Joiner – slots wood for alignment biscuits in fixture building.
  • Nail Gun – rapid assembly of wooden welding curtains / crates; powered by pneumatic, combustion, or electromagnetic force.
  • Moisture Meter
    • Detects moisture in wood; acceptable range for welding fixture lumber: 5%−40%5\% - 40\% scale.
  • Wood Router, Heat Gun, Planer, Jointer (mentioned in ultimate list) – broaden versatility in fabrication shop.

Practical, Ethical & Safety Implications

  • Ethical duty to operate tools within manufacturer specifications; prevents injury to self and colleagues.
  • Proper PPE per tool class (safety glasses, face shield, gloves, hearing protection, respiratory mask, insulated boots).
  • Lock-out/Tag-out procedures when servicing stationary equipment.
  • Environmental stewardship: capture dust, manage metal filings, recycle spent abrasive wheels.
  • Skill development via “constant correct practice” (module leitmotif) elevates employability and supports global competitiveness.

Typical Learner Activities in the Module

  • What I Know: 5-item pre-test (AWS code identification, FCAW definition, etc.).
  • What’s In & What’s New: Relate AWS codes to tool usage; recognise market demand for skilled welders.
  • What Is It: Core reading on power-tool definitions & classification (summarised above).
  • What’s More: Reflective writing on importance of studying tools for SMAW.
  • What I Have Learned: Short-answer recap of tool types & functional value.
  • What I Can Do: Matching exercise (table saw, belt sander, abrasive saw, electric drill, angle grinder).
  • Assessment: 10-item multiple-choice test covering tool identification and function.

Connections to Real-World Welding Practice

  • Accurate cutting & beveling with saws and grinders ensures proper root gap for SMAW, minimizing defects like lack of fusion.
  • Clean-up with vacuum and sanding tools supports post-weld finishing to customer-specified surface class (e.g., Ra\text{Ra} roughness values).
  • Pneumatic impacts satisfy high-torque bolting in field erections compliant with AWS D1.1\text{AWS D1.1} clause on bolted connections.

Numerical & Technical References Captured

  • Moisture-meter wood scale: 5%−40%5\% - 40\%.
  • Typical sound level for impact wrench: >90 dB(A)90\, \text{dB(A)} (necessitates hearing protection).
  • Historical note: Electric drill patented in 18891889 by Arnot & Brain.
  • AWS code citations: D1.1, D1.2, D1.3, D1.4, D1.6\text{D1.1, D1.2, D1.3, D1.4, D1.6}.

Study Tips

  • Create flashcards for each tool with photo, primary use, and safety PPE.
  • Visit a workshop (virtual or physical) to observe correct handling.
  • Cross-reference AWS clauses that reference surface prep or tool-related variables.
  • Practise maintenance rituals: check brushes on electric motors, drain condensate from compressors.

End-of-Module Reminder

  • Follow six learner-guidelines: care for module, answer pre-test first, read instructions, uphold honesty, finish tasks sequentially, return module.
  • When difficulty arises, consult facilitator—stable support network emphasised by developers.