Award in Weldability of Carbon and Low Carbon Steels

This unit forms part of the Course in MCAST Award in Weldability of Metals and the Management of Engineering Welding. Once a learner complete all the units in this course satisfactorily; that is has obtained a pass mark in the assessment and respected the 80% attendance s/he will achieve an award pegged at MQF Level 5, 20 ECVET Credits

The integral part of this unit deals with the correct and appropriate procedures to weld Carbon and Low Alloy Steels developed from practical applications and from the recommended manufacturers and supplier data. The welding classification and the main general classes of steel, according to composition, are also evaluated and the ideal technological set-up to produce quality welds to industrial standard is discussed.

This is a 32 hrs of guided learning course. Students need to invest further hours in the course, which will include private study and home assignments.

Lessons are held as indicated on the prospectus and website.

Learning Outcome 1: Identify properties of carbon and low carbon steels from the weldability stand point

Unit Content

• Carbon Steels: low carbon steel, mild steel, medium carbon steel, high carbon steel
• High-strength steel alloys; Quenched-and-tempered steels; Heat-treated low alloy steels; Chromium-Molybdenum Steels; Pre-Coated Steels

Learning Outcome 2: Explain the contributing conditions to hydrogen induced cracking

Unit Content

• Stressed development from transformation hardening; excessive stressing point (joint design);
• Measures to avoid hydrogen-induced cracking: filler metal; moisture in the electrode covering; welding flux or shielding gas; contaminant on the filler or bare metal; martenistic micro-structure contribution; minimizing the formation of martensite in the weld metal
• Stresses: thermal contraction of the weld metal heat-affected zone; restraint on the welded joint imposed by the weldment design; the fabrication design
• Underbead cracking: at the heat-affected zone of hardenable steel;
• Weld metal cracking: less frequent than parent metal – common form: small bright spots

Learning Outcome 3: Evaluate methods that should be considered to avoid cracking

Unit Content

• Welding process: Arc Welding – shielded metal-arc welding; gas shielded arc welding; flux cored arc welding; submerged arc welding: electroslag and electrogas welding; oxyacetylene welding; resistance welding, brazing
• Electrodes that produces little or no hydrogen; a combination of welding and thermal treatments; welding procedures for low welding stresses and eliminate lamellar tearing

The following are the suggested pre-requisites and/or entry requirements needed:
Pre-requisites;

• Hand on experience in one or more welding process.
• Knowledge of local Health and Safety Legislation
• Familiar with construction/ industrial sites.

Entry Requirements:

• Level 4 or above in Welding and Fabrication.
• Level 4 in Physics plus industry experience.

Applicants may be called for an interview prior the commencement of the course.

Course participants may be awarded either an MCAST Certificate of Attendance or an MCAST Certificate of Achievement.

MCAST Certificate of Attendance

• An MCAST Certificate of Attendance will be awarded to those candidates who attend at least 80% of the lessons.

MCAST Certificate of Achievement

• An MCAST Certificate of Achievement will be awarded to those candidates who satisfy the 80% attendance criteria AND ALSO choose to sit and pass the course assessment/s.
• Students who opt not to sit for the assessment/s or fail (the assessment/s) will however be awarded an MCAST Certificate of Attendance provided that they fulfill the minimum attendance criteria as stated above.

If the student intends to obtain a Certificate of Achievement, she/he is required to sit for an assessment/s. Assessment/s may take various forms such as a home assignment, class assignment, practical test and time constrained test. However, the assessment/s is not compulsory and an applicant may choose not to sit for it.

There are no additional costs or special materials / equipment to bring.