Official Course Description: MCCCD Approval: 10/22/96
SUN141 19972-20046	LEC	2 Credit(s)	2 Period(s)
Metal Preparation, Joints and Welding Symbols
Cleaning base metal, joint design considerations and preparing base metal joints for welding. Job code specifications and use of fit-up gauges and measuring devices to check joint fit up. Causes of distortion and joint misalignment. American Welding Society (AWS) Standard A2.4 on specific welding, and non-destructive examination symbols. Includes symbol reading exercise. Prerequisites: (Indentured status with the Arizona Builders Alliance and SUN136) or permission of the apprenticeship coordinator.

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MCCCD Official Course Competencies:
SUN141   19972-20046	Metal Preparation, Joints and Welding Symbols

1.	List and define specific trade terms. (I)
2.	Demonstrate correct procedures for cleaning base metal for welding and cutting. (II)
3.	Identify and explain specific joint designs and joint design considerations. (III)
4.	Prepare base metal joints for welding. (IV)
5.	Identify and explain job code specifications. (V)
6.	Demonstrate the use of fit-up gauges and measuring devices to check joint fit-up. (VI)
7.	Use plate and pipe fit-up tools to fit up joints. (VII)
8.	Identify and explain distortion and how it is controlled and check for joint misalignment and poor fit-up. (VIII)
9.	List and explain American Welding Society (AWS) Standard A2.4, Standard Symbols for Welding, Brazing and Non- destructive Examination. (IX)
10.	Identify and explain specific welding and non-destructive examination symbols. (IX)
11.	Read welding symbols on drawings, specifications and Welding Procedure Specifications (WPSs). (X)

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MCCCD Official Course Outline:
SUN141   19972-20046	Metal Preparation, Joints and Welding Symbols

I. Trade Terms A. Distortion B. Ductile C. Load D. Nonferrous E. Oxides F. Plasma arc cutting G. Consumable insert H. Filler metal I. PQR (Performance Qualification Report) J. Weldment K. Procedure qualification L. Radiograph M. Site quality specifications N. Other II. Cleaning Base Metal A. Surface corrosion B. Defects caused by surface contamination C. Mechanical cleaning 1. Hand tools 2. Power tools 3. Sand blasting D. Chemical cleaning 1. Chemical types 2. MSDS (Material Safety Data Sheets) 3. Safe use and storage III. Joint Design A. Forces 1. Tensile 2. Compression 3. Bending 4. Torsion 5. Shear B. Types of joints 1. Butt 2. Lap 3. Tee 4. Corner 5. Edge C. Types of welds 1. Surfacing 2. Plug and slot 3. Fillet 4. Groove 5. Combination groove and fillet D. Joint design considerations 1. Codes and welding procedure specifications (WPSs) 2. Joint preparation 3. Weld size 4. Single vs. double groove welds 5. U- and J-groove preparation 6. Groove angles and root openings 7. Open root welds 8. Welds with backing on plate 9. Welds with gas backing on pipe 10. Welds with backing rings on pipe 11. Welds with consumable inserts on pipe 12. Socket joints 13. Loading 14. Fillet and groove welds 15. Welding position IV. Welding Joint Preparation A. Identify joint specification B. Mechanical joint preparation 1. Grinders 2. Nibblers/cutters C. Thermal joint preparation V. Job Code Specifications A. Governing codes and standards 1. API (American Petroleum Institute) 2. ASME (American Society of Mechanical Engineers) 3. AWS (American Welding Society) B. Code changes C. WPS - Welding Procedure Specification 1. Scope 2. Base metal 3. Welding process 4. Filler metal 5. Joint design and tolerances 6. Welding details 7. Positions of welding 8. Second side preparation 9. Postheat treatment 10. Other VI. Fit-Up Gauges and Measuring Devices A. Straight edges B. Squares 1. Framing 2. Combination tri-square C. Levels 1. Conventional 2. Torpedo D. Hi-Lo gauge VII. Joint Fit-up A. Positioning tools 1. Hydraulic jacks 2. Chain falls 3. Comealongs B. Plate fit-up tools 1. Strongbacks 2. Clips, yokes and wedges 3. Plate alignment tool C. Pipe fit-up tools 1. Pipe jacks and rollers 2. Chain clamps 3. Small-diameter clamping devices 4. Pipe puller 5. Flange alignment tool VIII. Weldment Distortion and Fit-up A. Causes of distortion B. Properties of metals and distortion 1. Mild steel vs. stainless steel 2. Mild steel vs. high strength steel 3. Mild steel vs. aluminum C. Controlling distortion 1. Tack welding 2. Fixtures, strongbacks, clamps and braces 3. Presetting and pre-bending 4. Preventing over-welding 5. Intermittent welding 6. Backstep welding 7. Welding sequence 8. Heat treatments D. Joint misalignment and poor fit-up IX. Standard Symbols - AWS Standard A2.4 A. Welding symbols 1. Welding symbol base 2. Fillet 3. Plug/slot 4. Spot projection 5. Seam 6. Backing 7. Surfacing 8. Edge 9. Corner 10. Other B. Location of weld symbols and arrow significance C. Combining weld symbols D. Sizing and dimensioning welds 1. Sizing fillet welds 2. Dimensioning fillet welds 3. Sizing groove welds 4. Dimensioning groove weld length 5. Sizing and dimensioning plug welds 6. Sizing and dimensioning slot welds E. Supplemental weld symbols 1. Weld all around 2. Field weld 3. Contour finish F. Other welding symbols 1. Backing and spacer 2. Backing 3. Melt thru 4. Surfacing 5. Flange weld 6. Spot weld 7. Seam weld X. Symbol Reading Exercise A. Drawings B. Specifications C. WPSs

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