SAQA

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SOUTH AFRICAN QUALIFICATIONS AUTHORITY

REGISTERED UNIT STANDARD THAT HAS PASSED THE END DATE:

Remove metals using oxy-fuel and air-carbon arc gouging processes

SAQA US ID	UNIT STANDARD TITLE
12251	Remove metals using oxy-fuel and air-carbon arc gouging processes
ORIGINATOR
SGB Manufacturing and Assembly Processes
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-
FIELD			SUBFIELD
Field 06 - Manufacturing, Engineering and Technology			Manufacturing and Assembly
ABET BAND	UNIT STANDARD TYPE	PRE-2009 NQF LEVEL	NQF LEVEL	CREDITS
Undefined	Regular	Level 3	NQF Level 03	4
REGISTRATION STATUS		REGISTRATION START DATE	REGISTRATION END DATE	SAQA DECISION NUMBER
Passed the End Date - Status was "Reregistered"		2005-07-19	2008-07-19	SAQA 0160/05
LAST DATE FOR ENROLMENT		LAST DATE FOR ACHIEVEMENT
2009-07-19		2012-07-19

In all of the tables in this document, both the pre-2009 NQF Level and the NQF Level is shown. In the text (purpose statements, qualification rules, etc), any references to NQF Levels are to the pre-2009 levels unless specifically stated otherwise.

This unit standard does not replace any other unit standard and is not replaced by any other unit standard.

PURPOSE OF THE UNIT STANDARD

This unit standard is for a learner within the fabrication and welding fields.

A person credited with this unit standard is capable of:

Describe and assemble the air-carbon arc gouging equipment

Select, assemble and conduct pre operational checks on air-carbon arc gouging equipment

Gouge workpieces

Inspect gouged work pieces

Care and store gouging consumables and equipment

This unit standard will contribute to the full development of any learner by providing recognition, further mobility and transportability within the field. The knowledge, skills and understanding demonstrated in this unit standard are essential for social and economic transformation and upliftment within the fabrication and welding environment.

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING

National Certificate in Welding Application and Practice NQF level 2.

UNIT STANDARD RANGE

Scope:

Range of materials used is:

Low and medium carbon steel (over 6mm thick)

Context:

All work undertaken must comply with Occupational Health and Safety Act

All work done must comply with worksite practices

All work done under limited supervision

Level:

Level (for level 3)
A learning programme leading to the award of this unit standard should develop learners who demonstrate:
(a) A range of well-developed skills
(b) An ability to offer a significant choice of procedures
(c) Some relevant theoretical knowledge
(d) An ability to interpret available information
(e) An ability to respond to familiar problems
(f) An ability to function with significant responsibility

Specific Outcomes and Assessment Criteria:

SPECIFIC OUTCOME 1

Describe and assemble the air-carbon arc gouging equipment.

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. The importance of correct assembly of the air-carbon arc gouging equipment, and the consequences of incorrect assembly, is explained with reference to the manufacture's requirements.

ASSESSMENT CRITERION 2

2. Basic and major components of the air-carbon arc gouging equipment are identified and the explanation of function and purpose is correct in terms of manufacture's requirements and standards.

ASSESSMENT CRITERION 3

3. Parts and components correctly identified and the implications for incorrect identification explained.

ASSESSMENT CRITERION 4

4. Terms and definitions used are consistent with generally accepted gouging terminology as recorded in gouging standards.

ASSESSMENT CRITERION RANGE

Parts include: Hoses, hose clamps, air supply cylinder, gauges, gouging electrode holder, non-return valves.
Power source requirements: DC/AC current supply

SPECIFIC OUTCOME 2

Select, assemble and conduct pre operational checks on air-carbon arc gouging equipment.

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. Verification, identification and selection of air-carbon arc gouging equipment as specified per job requirements.

ASSESSMENT CRITERION 2

2. Unsafe and defective equipment is identified and reported.

ASSESSMENT CRITERION 3

3. Identification and rectification of hazards relate to gouging process in accordance with standard work site practices.

ASSESSMENT CRITERION 4

4. Pre operational checks are carried out in accordance with manufacture's specifications.

ASSESSMENT CRITERION RANGE

Resources to include: manufacture's operational and specifications manual, worksite practices and safety and environmental issues. (Personal protective equipment)

SPECIFIC OUTCOME 3

Gouge workpieces.

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. Safety precaution adhered to during gouging process.

ASSESSMENT CRITERION 2

2. Workpiece cleaned after gouging as per worksite practices.

ASSESSMENT CRITERION 3

3. Gouging parameters and air pressure settings are established to job requirements and manufacturer's specifications.

ASSESSMENT CRITERION 4

4. Metal removed by gouging to suit job requirements.

ASSESSMENT CRITERION 5

5. Work piece cleaned to remove all contaminated surfaces.

ASSESSMENT CRITERION RANGE

Heat input, metal transfer mode, gouging technique, and consumable handling.

Material type to be gouged: Low and medium carbon steels over 6mm thick

Resources include: gouging equipment, tools, protective clothing and equipment, gouging instruction sheet

SPECIFIC OUTCOME 4

Inspect gouged work pieces.

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. Gouged workpiece conform to specifications as reflected on drawing.

ASSESSMENT CRITERION 2

2. Inspection methods and procedures selected is conducive to job requirements.

ASSESSMENT CRITERION RANGE

Defects removal determined visually
Or
with the aid of dye penetrant inspection method when required.

ASSESSMENT CRITERION 3

3. Excess material/defects removed.

ASSESSMENT CRITERION 4

4. Documentation completed as reflected in worksite practices.

ASSESSMENT CRITERION RANGE

Procedures include: Worksite practices, inspection methods visual only, and cleaning procedures

SPECIFIC OUTCOME 5

Care and store gouging consumables and equipment.

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. Tools and equipment care for as per worksite practices.

ASSESSMENT CRITERION 2

2. Tools and equipment stored to conform to worksite practices and procedures.

ASSESSMENT CRITERION 3

3. Gouging consumables stored in accordance with worksite practices and procedures.

ASSESSMENT CRITERION RANGE

Tools and equipment cared for is limited to defect reporting and stored in a usable condition for next user

UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS

Anyone assessing a learner against this unit standard, must be registered as an assessor with the relevant ETQA.

Any institution offering learning that will enable achievement of this unit standard must be accredited in terms of the criteria laid down by the relevant ETQA.

Moderation of assessment will be overseen by the relevant ETQA according to the moderation guidelines in the relevant qualification and the agreed ETQA procedures.

UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE

Names & functions of:

Types of electrodes

Types of nozzles

Equipment

Personal protective equipment

Attributes, descriptions, characteristics & properties:

Types of metals

Features of oxy-fuel gas and air-carbon arc

Gouging defects and their causes

Gouging parameters

Consumables

Hazards

Different sizes and types of electrodes

Sensory cues

Sound of escaping gas indicating leaks

Smell indicating gas leaks

Smell indicating overheating equipment

Purpose of:

Specific worksite safety practices

Use and care of appropriate personal protective equipment

Pressure regulators

Maintenance of nozzles

Quality control measures

Safety checks

Preparation of materials

Selection of appropriate consumables

Processes, events, causes and effects, implications:

Causes of hazards

Implications of ignoring gouging defects

Implications of unsafe work practices

Implications of not preparing workpiece before gouging

Effect on gouge quality of incorrect gouging parameters

Procedures and techniques

Set up procedures for gouging equipment

Methods of safe and efficient positioning and support

Safety procedures

Quality procedures

Recording and reporting procedures

Regulations, legislation, agreements, policies, standards

Company quality standards

Applicable safety, health and environmental protection legislation and standards

Theory: rules, principles, laws

Basic principles of oxy-fuel gas and air carbon arc processes

Safety rules

Relationships, systems:

Relationship of oxy-fuel and air-carbon arc processes to gouging of materials

Critical Cross-field Outcomes (CCFO):

UNIT STANDARD CCFO IDENTIFYING

Identify and solve problems:

Recognise problems while gouging metals and respond appropriately

Recognise and correct defects

UNIT STANDARD CCFO WORKING

Work together with others:

Contribute to workgroup efforts

UNIT STANDARD CCFO ORGANISING

Organise and manage myself and my activities:

Plan sequence of operations based on job instructions and set up equipment appropriately

UNIT STANDARD CCFO COLLECTING

Collect, analyse, organise and critically evaluate information:

Visual examination of gouges for defects

UNIT STANDARD CCFO COMMUNICATING

Communicate effectively:

Record information on outcome of work and provide feedback to appropriate personnel

UNIT STANDARD CCFO SCIENCE

Use science and technology effectively and critically:

Understanding of oxy-fuel and air-carbon arc processes

UNIT STANDARD CCFO DEMONSTRATING

Demonstrate an understanding of the world as a set of related systems:

Relationship between gouging electrode and depth of gouge

UNIT STANDARD ASSESSOR CRITERIA

Assessors should keep the following general principles in mind when designing and conducting assessments against this unit standard:

Focus the assessment activities on gathering evidence in terms of the main outcome expressed in the title to ensure assessment is integrated rather than fragmented. Remember we want to declare the person competent in terms of the title. Where assessment at title level is unmanageable, then focus assessment around each specific outcome, or groups of specific outcomes.

Make sure evidence is gathered across the entire range, wherever it applies. Assessment activities should be as close to the real performance as possible, and where simulations or role-plays are used, there should be supporting evidence to show the candidate is able to perform in the real situation.

Do not focus the assessment activities on each assessment criterion. Rather make sure the assessment activities focus on outcomes and are sufficient to enable evidence to be gathered around all the assessment criteria.

The assessment criteria provide the specifications against which assessment judgements should be made. In most cases, knowledge can be inferred from the quality of the performances, but in other cases, knowledge and understanding will have to be tested through questioning techniques. Where this is required, there will be assessment criteria to specify the standard required.

The task of the assessor is to gather sufficient evidence, of the prescribed type and quality, as specified in this unit standard, that the candidate can achieve the outcomes again and again and again. This means assessors will have to judge how many repeat performances are required before they believe the performance is reproducible.

All assessments should be conducted in line with the following well documented principles of assessment: appropriateness, fairness, manageability, integration into work or learning, validity, direct, authentic, sufficient, systematic, open and consistent

UNIT STANDARD NOTES

This unit standard may be obtained through RPL. The learner should be thoroughly briefed on the mechanism to be used and support and guidance should be provided. Care should be taken that the mechanism used provides the learner with an opportunity to demonstrate competence and is not so onerous as to prevent learners from taking up the RPL option towards gaining a qualification.

QUALIFICATIONS UTILISING THIS UNIT STANDARD:

	ID	QUALIFICATION TITLE	PRE-2009 NQF LEVEL	NQF LEVEL	STATUS	END DATE	PRIMARY OR DELEGATED QA FUNCTIONARY
Elective	22870	National Certificate: Engineering Fabrication (light or heavy)	Level 3	NQF Level 03	Passed the End Date - Status was "Reregistered"	2007-08-16	MERSETA

PROVIDERS CURRENTLY ACCREDITED TO OFFER THIS UNIT STANDARD:

This information shows the current accreditations (i.e. those not past their accreditation end dates), and is the most complete record available to SAQA as of today. Some Primary or Delegated Quality Assurance Functionaries have a lag in their recording systems for provider accreditation, in turn leading to a lag in notifying SAQA of all the providers that they have accredited to offer qualifications and unit standards, as well as any extensions to accreditation end dates. The relevant Primary or Delegated Quality Assurance Functionary should be notified if a record appears to be missing from here.

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