🛠️ Practical Trade & Direct Selection Position Private / Market Competitive ✓ 100% Comprehensive Preparation Guide

GAS WELDER (MARKET COMPETITIVE) — Practical Trade Test & Interview Preparation Guide

Official preparation blueprint, tool handling checklist, physical scrutiny standards, craftsmanship evaluation, and departmental interview viva questions for candidates appearing in the direct recruitment for GAS WELDER (MARKET COMPETITIVE) at Green Line Human Resource & Trade Test Center (Overseas Projects).

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Department / Organization Green Line Human Resource & Trade Test Center (Overseas Projects)
Place of Posting Ankara
💰 Estimated Salary Package PKR 35,000 - 48,000 / month (BPS-04)
Selection Process Trade Test & Viva Voce

Official Practical Trade Test Protocol & Technical Viva Voce Guide

Vocational Evaluation Blueprint for GAS WELDER (BPS-04)

🛠️ 1. Practical Trade Test & Evaluation Protocol (100 Marks Total)

Candidates are evaluated through a rigorous hands-on trade test conducted in a live workshop environment where they must fabricate test coupons demonstrating welding, brazing, and cutting competencies. The practical score is combined with a structured technical viva voce assessing theoretical knowledge of metallurgy, equipment mechanics, safety codes, and workshop discipline to determine final

Evaluation Parameter Max Marks Scoring Criteria Disqualification Triggers
Joint Preparation, Fit-up & Electrode Selection 25 Marks Bevel angle preparation (60-70 degrees), root face filing, tack welding with correct gap (2-3mm), cleaning rust/scale, and choosing correct electrode grade (AWS E6013/E7018) and amperage. Incorrect root gap causing blow-through or lack of penetration, grease on joint surfaces, or mismatched electrode grade.
Arc Strike, Beading & Penetration Uniformity 30 Marks Visual inspection of weld bead uniformity, consistent travel speed, ripple formation, full root penetration without undercut, and overlap in flat (1G) and horizontal (2G) positions. Presence of cracks, excessive spatter, lack of sidewall fusion >3mm, burn-through, or uneven bead height exceeding tolerances.
Slag Removal, Weld Inspection & Defect Remediation 20 Marks Chipping hammer slag removal, wire brushing, visual inspection identifying porosity or slag inclusion, and proper grinding/feathering of stop-start tie-ins. Leaving slag in multi-pass welds, chipping slag toward face without safety visor, or excessive gouging with grinding wheel.
Gas Cylinder Handling, Ventilation & Fire Safety Drill 25 Marks Demonstrating cylinder transport on trolley with safety caps, leak testing regulator connections with soap solution (never match), flashback arrestor check, and fire extinguisher readiness. Rolling cylinders horizontally, using oil/grease on oxygen fittings, lighting torch without spark lighter, or missing PPE.

⚡ 2. Real-World Practical Scenarios & Step-by-Step SOPs

The trade test evaluation committee assigns real-time operational challenges designed to assess execution reflexes under pressure:

Practical Task 1: Pre-Start Electromechanical Inspection & Operating Log Protocol

Operational Challenge: Starting and monitoring a water pumping unit, passenger elevator, or standby electromechanical plant at shift commencement.

💡 Model Answer Checklist: 1. Inspect incoming 3-phase supply voltage (380-415V), earth continuity, and control panel indicators before switching on. 2. Check lubrication oil levels, gland packing drip rate, or safety door interlocks. 3. Start the unit smoothly and monitor running current (amperes) and pressure/level gauges. 4. Record start time, voltage, amperage, and operational status in the Plant Logbook.
Quality Target: Stable amperage within rated nameplate capacity, zero abnormal vibration, and complete logbook entry.
Practical Task 2: Overload Relay Trip / Emergency Shutdown & Fault Isolation

Operational Challenge: Motor control panel trips on thermal overload or safety interlock during peak operational demand.

💡 Model Answer Checklist: 1. Immediately switch selector to OFF and engage Lockout-Tagout (LOTO) isolation before touching mechanical parts. 2. Check for phase failure, voltage drop, jammed impeller/brake shoe, or excessive load. 3. Allow motor windings to cool, test insulation resistance, and clear the mechanical obstruction. 4. Reset thermal overload relay and perform a supervised test run.
Quality Target: Strict adherence to electrical lockout safety and root-cause verification before resetting.
Practical Task 3: Preventive Maintenance, Gland Packing & Safety Interlock Check

Operational Challenge: Routine weekly preventive maintenance to prevent shaft leakage, bearing overheating, or cable wear.

💡 Model Answer Checklist: 1. Isolate power supply and place maintenance warning signage. 2. Inspect bearing housing temperature, grease nipples, coupling alignment, or hoist ropes/valves. 3. Adjust gland follower nuts evenly so packing remains cool without shaft scoring. 4. Clean panel contactors and record completed maintenance in the Equipment History Register.
Quality Target: Zero overheating, smooth mechanical operation, and compliance with preventive maintenance schedules.

🎙️ 3. Technical & Professional Oral Viva Voce Examination

Immediately following practical trials, candidates undergo oral questioning by the departmental selection committee:

Q1: Why must a centrifugal water pump be primed before starting?
Candidate Response: Running a centrifugal pump dry without water priming causes air binding, fails to build suction lift, and rapidly burns the mechanical seal or gland packing due to friction heat.
Q2: What is the purpose of a Thermal Overload Relay in a motor starter panel?
Candidate Response: It protects the electric motor windings from burning out by automatically tripping the circuit if the motor draws excessive current due to overload or single-phasing.
Q3: What immediate steps should a Lift Operator take if an elevator stops between floors due to power failure?
Candidate Response: Remain calm, reassure passengers, press the emergency alarm/intercom to alert maintenance, ensure cabin doors stay closed, and switch to the ARD (Automatic Rescue Device) or standby generator to level the cabin at the nearest floor.
Q4: What does Lockout-Tagout (LOTO) mean during equipment maintenance?
Candidate Response: Lockout-Tagout means physically disconnecting and padlocking the main electrical breaker with a warning tag so no one can accidentally switch on the machine while a worker is repairing it.
Q5: What daily entries are recorded in an Operator Logbook?
Candidate Response: Date, shift timing, starting and stopping hours, supply voltage, motor current (amps), pressure/water level readings, fuel/lubricant consumed, and any fault observations.

📅 4. 14-Day Practical Preparation Roadmap

Follow this daily regimen to develop muscle memory and pass the trade trial without hesitation:

  • Days 1-3: Core Competency & Equipment Familiarization: Study core requirements, essential tools, materials, and standard workplace procedures for GAS WELDER.
  • Days 4-7: Timed Standard Operations: Repeatedly practice routine operational tasks and workflows under simulated stopwatch conditions.
  • Days 8-10: Troubleshooting & Contingency Procedures: Practice identifying common operational snags, safety hazards, and emergency protocols.
  • Days 11-12: Oral Viva & Official Etiquette Rehearsal: Rehearse verbal explanations of duties, departmental hierarchy, and situational problem-solving.
  • Days 13-14: Full-Scale Mock Demonstration: Execute full practical demonstration from initial inspection to final reporting in one continuous timed trial.
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