Welding Processes in Heavy Manufacturing: Quality Controls Course

Lesson 1 • Metallurgy Basics for Welders

Covers atomic structure, grain behaviour, and heat effects on steel and alloys. Provides the metallurgical foundation needed to understand weld quality outcomes.

Lesson 2 • Heat Input and Thermal Cycles

Explains how heat input parameters drive thermal cycles and affect mechanical properties. Links parameter selection to downstream quality control decisions.

Lesson 3 • Welding Safety and Hazard Control

Identifies physical, chemical, and electrical hazards in heavy manufacturing welding environments. Establishes mandatory safety practices before any process training begins.

Lesson 1 • SMAW Equipment and Setup

Covers power source types, polarity selection, and cable sizing for SMAW. Proper setup directly affects arc stability and weld quality.

Lesson 2 • Arc Technique and Travel Variables

Develops arc length control, travel speed, and electrode angle skills. These variables directly determine bead profile, fusion, and defect rates.

Lesson 3 • Electrode Classification and Selection

Teaches the electrode classification system, covering tensile strength, position, and flux coating types. Correct electrode choice is critical for meeting mechanical property requirements.

Lesson 1 • Metal Transfer Modes

Explains short-circuit, globular, spray, and pulsed transfer modes and their application ranges. Transfer mode selection governs penetration, spatter, and positional capability.

Lesson 2 • FCAW Wire Types and Shielding Options

Distinguishes gas-shielded and self-shielded FCAW wires and their suitability for heavy structural work. Wire selection affects mechanical properties and outdoor usability.

Lesson 3 • GMAW System Components and Setup

Identifies wire feeder, gun, liner, and shielding gas components and their interactions. Correct setup prevents feeding problems and arc instability.

Lesson 4 • Out-of-Position GMAW and FCAW Techniques

Develops vertical, overhead, and horizontal welding techniques for GMAW and FCAW. Heavy fabrication frequently requires out-of-position work on large assemblies.

Lesson 1 • SAW Parameter Optimization

Develops skills to set and optimise current, voltage, travel speed, and flux depth for SAW. Parameter balance controls penetration, bead shape, and dilution.

Lesson 2 • Electroslag and Electrogas Welding

Covers ESW and EGW processes for single-pass vertical welding of thick sections. These processes are used in shipbuilding and heavy structural column fabrication.

Lesson 3 • Submerged Arc Welding Fundamentals

Explains SAW arc physics, flux-wire interactions, and equipment configurations for heavy plate work. SAW delivers the highest deposition rates in structural fabrication.

Lesson 1 • Defect Acceptance and Rejection Criteria

Applies workmanship and engineering-critical assessment criteria to classify defects as acceptable or rejectable. Connects discontinuity severity to structural risk.

Lesson 2 • Geometric and Profile Discontinuities

Addresses overlap, underfill, excessive convexity, and misalignment as geometric quality issues. Profile defects affect fatigue life and stress concentration in heavy structures.

Lesson 3 • Fusion and penetration defects

Identifies lack of fusion, incomplete joint penetration, and undercut and connects them to technique and parameter errors. These defects reduce load-carrying capacity.

Lesson 4 • Porosity: types and causes

Classifies distributed, cluster, and piping porosity and links each type to specific contamination or shielding failures. Accurate classification guides corrective action.

Lesson 1 • Advanced NDE: PAUT and TOFD

Introduces phased array UT and time-of-flight diffraction for high-accuracy weld inspection. These methods are increasingly required in heavy fabrication quality plans.

Lesson 2 • Radiographic testing of welds

Teaches RT film and digital techniques for volumetric inspection of weld cross-sections. RT is the standard method for pressure vessel and pipeline weld qualification.

Lesson 3 • Liquid penetrant and magnetic particle testing

Covers PT and MT procedures for detecting surface and near-surface discontinuities. These methods are widely used for weld toe and root surface inspection.

Lesson 4 • Ultrasonic testing fundamentals

Develops UT scanning skills for detecting internal volumetric and planar defects in heavy sections. UT is preferred for thick-plate welds where RT is impractical.

Lesson 1 • Welding procedure specification development

Covers all essential and supplementary essential variables required in a WPS. A properly written WPS defines the repeatable process that produces code-compliant welds.

Lesson 2 • Qualification record auditing

Develops skills to audit WPS, PQR, and WPQ records for completeness and compliance. Audit readiness is a key requirement in third-party and customer quality reviews.

Lesson 3 • Welder performance qualification

Covers WPQ test positions, thickness ranges, and process variables that define a welder's qualified scope. Welder qualification limits the risk of human-factor weld defects.

Lesson 1 • Weld quality auditing and continuous improvement

Develops internal audit skills and applies lean and Six Sigma tools to reduce weld defect rates. Continuous improvement closes the loop between inspection data and process changes.

Lesson 2 • Inspection and test plan development

Teaches construction of ITPs that define hold points, witness points, and review points for weld inspection. ITPs are the primary tool for controlling quality at each fabrication stage.

Lesson 3 • Statistical process control for welding

Applies SPC tools to monitor weld parameter stability and defect rates over production runs. SPC enables proactive quality control before defects reach critical levels.

Lesson 4 • Regulatory and customer quality requirements

Aligns the quality management system with applicable fabrication standards and customer specifications. Understanding external requirements prevents costly nonconformances during final inspection.