ECIW05 Join materials by MIG/MAG welding

Transcription

1 Overview This standard is about joining materials by the MIG/MAG welding process in engineering construction. You will need to prepare the equipment and materials to be welded and using the MIG/MAG welding processes join the materials to the required standard taking into account the environmental considerations whilst adhering to health and safety legislation, regulations and safe working practices. In the context of this standard, your responsibility is to interpret and work within given specifications, selecting techniques and making variations to achieve the best possible result. In some cases, you may still be expected to refer to others for final authorisation, even though you remain responsible for identifying and implementing decisions. Who is this standard for This standard is for Welders. 1

2 Performance criteria You must be able to: P1 work safely at all times, complying with health and safety and other relevant legislation, regulations, guidelines and local rules or procedures P2 ensure that the work environment, materials, tools and equipment are suitably prepared for the work activities to be undertaken P3 follow the relevant welding specifications and joining instructions P4 ensure the joint preparation complies with the specification P5 make the joints to the specified quality requirements using appropriate MIG/MAG welding process P6 deal promptly with excess materials, waste and temporary attachments in line with procedures P7 reinstate the work area P8 deal promptly and effectively with problems within your control and report those that cannot be solved 2

3 Knowledge and understanding You need to know and understand: K1 relevant legislative, regulatory and local requirements or procedures and safe working practices K2 preparation and reinstatement requirements in respect of the work area, material and equipment and the possible consequences of incorrect actions in these areas K3 purpose and uses of specifications and welding procedures K4 MIG/MAG welding process and equipment K5 welding characteristics of materials and consumables K6 equipment setting, operating and care procedures K7 quality control and test procedures for detection of defects in weldments K8 welder approval tests including an appreciation of related, approved industry standards K9 material segregation, preparation and finishing methods and techniques K10 your responsibilities for ensuring care and security of tools and equipment used K11 your responsibilities with regard to reporting lines and procedures in your working environment 3

4 Additional Information Scope/range Work environment Typical work environments could include: 1 at height 2 confined spaces 3 controlled operational and offshore installations 4 designated work areas 5 engineering construction sites 6 existing plants and structures 7 fabrication workshops 8 nuclear power stations 9 onshore and offshore installations 10 potential explosive atmospheres 11 shafts 12 shipyards 13 tunnels 14 working on access structures (scaffold) 15 working inside plant and systems Specifications and joining instructions You must be able to interpret relevant specifications including welding procedure specifications and these could include: 1 cleaning (pre, post and intermediate) 2 consumable control 3 consumable specification (filler wire) 4 position/progression 5 root oxidation protection 6 technique 7 weld fit-up/set-up 8 welding parameters MIG/MAG welding process You must have an appreciation of arc voltage problems associated with cabling/circuit voltage drop and of the different types of welding equipment which could include: 4

5 1 gas supply and control systems 2 torches 3 wire feed systems Reinstate the work area 1 returning the work area to a safe condition 2 correctly disposing of waste materials 3 storage of reusable materials, consumables and equipment in accordance with appropriate procedures 4 completion of all necessary documentation Quality control and test procedures for detection of defects in weldments You must have an appreciation of NDT methods. This could be expected to include defect types related to MIG/MAG welding including visual inspection for lack of fusion, porosity, undercut, arc strikes, cold lap, excess penetration, cracking and oxidation and an appreciation of their causes and prevention. Material segregation, preparation and finishing methods and techniques This could include: 1 consumable drying, storage and control aspects 2 surface finish standard including oxide removal, cap profile, surface defects and associated remedial work (grinding/welding) 3 the need to segregate by type to prevent cross contamination of materials for example files, wire brushes, welding return clips (copper contamination), workbench tops and alignment aids 5

6 Developed by Engineering Construction Industry Training Board Version number 2 Date approved February 2013 Indicative review date Validity Status Originating organisation Original URN Relevant occupations Suite Key words February 2017 Current Original Engineering Construction Industry Training Board NW19ECRS5.14 Welder Welding Plate and Pipework Welding; MIG/MAG; engineering; construction; join 6