WELD 0003A. Gas Tungsten Arc Welding of Mild Carbon Steel on Sheet and Plate
Units: 2
Formerly known as WELD 10
Hours: 72 (18 lecture, 54 laboratory)
Designed for those interested in beginning stages of welding. Students are taught to weld on mild carbon steel sheet and plate in various welding positions and joint configurations using Gas Tungsten Arc Welding. Prepares students to work in welding shop environment. (CSU)
WELD 0003A - Introduction to Gas Welding - Preparing for GTAW
http://catalog.sierracollege.edu/course-outlines/weld-0003a/
Catalog Description Formerly known as WELD 10 Hours: 72 (18 lecture, 54 laboratory) Description: Designed for those interested in beginning stages of welding. Students are taught to weld on mild carbon steel sheet and plate in various welding positions and joint configurations using Gas Tungsten Arc Welding. Prepares students to work in welding shop environment. (CSU) Course Student Learning Outcomes CSLO #1: Apply knowledge of safety standards for both a learning environment and work site environment with focus on GTAW to perform student assignments. CSLO #2: Define terms related to this course; current, arc length, torch angle, work angle, travel speed, electrode manipulation, and arc profile. CSLO #3: Demonstrate single and multi-pass welds using GTAW on carbon steel sheet and plate in 2F, 3F, 4F, 2G, 3G, 4G positions on 16 ga, 14 ga, 12 ga, 10 ga, 1/8", and 1/4" mild steel. CSLO #4: Perform equipment set-up diagnostic procedures including assembly of the torch and identifying gas and coolant leak issues. Effective Term Fall 2025 Course Type Credit - Degree-applicable Contact Hours 72 Outside of Class Hours 36 Total Student Learning Hours 108 Course Objectives Lecture Objectives General Safety Identify typical safety hazards and precautions required when working in any typical metal workplace Identify personal protective equipment for head, eyes, ears, torso & arms, hands, legs, and feet that must/should be worn in a welding workspace as appropriate Apply appropriate safety measures for all individuals in a metal workplace Cylinder Safety and Owner vs Rental Cylinders List all safety precautions for non-flammable gas cylinder storage List all safety precautions for flammable gas cylinder storage List all safety precautions for flammable and non-flammable gas cylinder transportation Identify and explain markings on cylinder shoulders Explain the differences between owning and renting cylinders and how to identify each GTAW Welding Equipment Identify all external parts of applicable welding equipment Assemble and disassemble applicable welding components Describe the basic function of the welding process Know the difference between Constant Current and Constant Voltage machines Know that SMAW and GTAW use CC Know that GMAW and FCAW use CV Gas Tungsten Arc Welding Safety Identify all parts of a Gas Tungsten Arc Welding Set-Up Explain safety features of the GTAW components Memorize all safe operating procedures for GTAW Demonstrate safe operating procedures for GTAW unassisted Assemble torch, leads and coolant hoses. Identify gas and coolant leaks Tungsten Electrodes Name common GTAW tungsten electrodes and discuss their advantages/disadvantages for welding metal alloys Demonstrate tungsten sharpening techniques for various welding applications Describe the relationship between tungsten electrode size and current capacity Understand the relationship between tungsten consumables sizes and material dimensions Gas Tungsten Arc Welding Operation Proper Tungsten Grinding Techniques for various applications Nozzle size vs. welding application Torch and filler metal manipulation to control puddle heat and material deposition Essential Variables During the Welding Process Identify the variables that affect heat input and weld quality while performing a weld Current Arc length Direction of Travel & Travel Angle Work Angle Travel Speed Electrode Manipulation Gas Selection and adjustment as applicable Basic Welding Types, Joints, and Positions Identify the 4 basic welding types Surface, Fillet, Groove, Plug/Slot List the 2 most common welding types Identify the 5 basic welding joints Butt, Lap, Tee, Corner, Edge Basic Welding Positions and how Welding, Types, Joints, and Positions Combine Identify the 8 most common welding positions 1F- Flat Fillet, 2F- Horizontal Fillet, 3F- Vertical Fillet, 4F- Overhead Fillet 1G- Flat Groove, 2G- Horizontal Groove, 3G- Vertical Groove, 4G- Overhead Groove Understand how welding types are applied to the 5 basic welding joints and what the corresponding welding positions are for each of those situations Fillet Welds Identify the parts of a fillet weld and the 5 fillet weld profiles, (concave, flat, convex, excessive reinforcement, insufficient throat) Label which fillet weld profiles are desired, acceptable, generally unacceptable and always unacceptable. Explain the difference between a “weld symbol” and a “welding symbol” Know the fillet weld symbol Read all aspects of a fillet welding symbol and draw corresponding joints to dimension Identify the 3 basic parts of a welding symbol; arrow, reference line, and tail Know the significance of information placed above or below the reference line Welding Polarities Memorize the following polarities and their electron flow pattern Direct Current Electrode Positive Alternating Current Direct Current Electrode Negative Welding Electrodes/Filler Metals Decipher the parts of an electrode classification Name common filler metals and discuss their advantages/disadvantages for welding various carbon steel alloys Shielding Gasses Know which gasses are used for various applications in the lab Summarize shielding gasses used in GTAW and describe their characteristics and effectiveness Know the proper psi ranges for each application Tape Measure Use and Reading Know and use the basic features of a common tape measure and ruler in eighth inch increments Read tape measure in 1/8” increments right side up and upside down Memorize fractions to halves, quarters, and eights Basic Metallurgy Describe the difference between iron and steel Classify low, medium, and high carbon steel by percent carbon content Define hardness, strength, ductility, and weldability Explain basic relationship between carbon content, hardness, strength, ductility, and weldability. Laboratory Objectives Lab Assignments and/or Lab Projects Recall common terminology and concepts used in the application of welding operations and apply to the lab setting Employ pre-weld metal preparation techniques to ensure weld quality Demonstrate pre-weld procedures and apply correct welding parameter adjustment tasks. Apply foundational skills to weld carbon steel to industry-based-acceptance criteria Successfully weld single pass beads in various weld positions on various joint configurations with various metal thicknesses. Perform the following Lab Assignments using GTAW on Mild Carbon Steel: Repeating Corner Joint: 10ga or 1/8" base metal, 2F, 3F, and 4F. Repeating Lap Joint:10ga or 1/8" base metal, 2F, 3F, and 4F. Repeating Tee Joint: 10ga or 1/8" base metal, 2F, 3F, and 4F. Repeating Butt Joint:10ga or 1/8" base metal, 2F, 3F, and 4F. Extra Credit: Repeating Edge Joint: 10ga or 1/8" base metal, 2F, 3F, and 4F. Combo Joint: 10ga or 1/8" base metal Repeating Corner Joint: 14 ga or 16 ga base metal, 2F, 3F, and 4F. Repeating Lap Joint: 14 ga or 16 ga base metal, 2F, 3F, and 4F. Repeating Tee Joint: 14 ga or 16 ga base metal, 2F, 3F, and 4F. Repeating Butt Joint: 14 ga or 16 ga base metal, 2F, 3F, and 4F. Extra Credit: Repeating Edge Joint: 14 ga or 16 ga base metal, 2F, 3F, and 4F. Combo Joint: 14 ga or 16 ga base metal Repeating Corner Joint: 3/16" or 1/4" base metal, 2F, 3F, and 4F. Repeating Lap Joint: 3/16" or 1/4" base metal, 2F, 3F, and 4F. Repeating Tee Joint: 3/16" or 1/4" base metal, 2F, 3F, and 4F. Repeating Butt Joint: 3/16" or 1/4" base metal, 2F, 3F, and 4F. Extra Credit: Repeating Edge Joint: 3/16" or 1/4" base metal, 2F, 3F, and 4F. Combo Joint: 3/16" or 1/4" base metal General Education Information Approved College Associate Degree GE Applicability CSU GE Applicability (Recommended-requires CSU approval) Cal-GETC Applicability (Recommended - Requires External Approval) IGETC Applicability (Recommended-requires CSU/UC approval) Articulation Information CSU Transferable Methods of Evaluation Projects Example: 1. Student will be given welding procedure specification, asked to interpret the document to weld the desired weld bead to the correct parameters. Student will be evaluated using a grading rubric which is based on the visual acceptance criteria of Table 8.1 set forth in AWS D1.1 2020 code book. Skill Demonstrations Example: 1. Student will be tested in written format as well as demonstrate safe practices to operate metal working and listed welding equipment. a. Measuring instruments, such as tape measure, caliper, micrometer; b. Cylinders, regulators, torches, tips and hoses; h. Equipment care and maintenance. Repeatable No Methods of Instruction Laboratory Lecture/Discussion Distance Learning Lab: With instructor demonstration and oversight, students will operate Gas Tungsten Arc Welding Equipment. With instructor demonstration and oversight, students will develop Plasma Arc Cutting skill sets. Following class lecture, video presentation, and lab demonstration, student will practice manipulative skills in the welding process application. Lecture: Lecture and small group discussion of the uses of metal in the modern day. Distance Learning Instructor will use slide show presentation, instructor created video, or lecture presentation on a learning platform to teach about best safety practices in the for personal protective equipment, the weld lab environment, and/or tools & equipment. Students will be given a scenario and expected to list the best safety practices that should be employed and explain why they should be used. Students will submit the assignment via text entry, file upload, video or audio recording. Typical Out of Class Assignments Reading Assignments 1. Read about the history of metals before the 20th century in print and web-based material. Be prepared to discuss in class the development of welding as it applies to the Industrial Revolution. 2. Read text chapter on Gas Tungsten Arc Welding, equipment and components and be prepared to discuss. Writing, Problem Solving or Performance 1. Complete the assigned hands-on competency in each metalwork and welding portion of the individual course project. For example, the student will practice gas welding until they pass a proficiency examination. 2. Demonstrate the safe use of the equipment and tools used in the metal working shop. For example, the student will practice the steps in the safe operation of a tungsten grinder. Other (Term projects, research papers, portfolios, etc.) 1. Each student to complete the assigned course project. Required Materials Welding Principles and Practices Author: Edward R. Bohnart Publisher: McGraw-Hill Publication Date: 2017 Text Edition: 5th Classic Textbook?: OER Link: OER: Gas Tungsten Arc Welding Handbook Author: Minnick, Prosser Publisher: Goodheart-Wilcox Publication Date: 2021 Text Edition: 7th Classic Textbook?: No OER Link: OER: Other materials and-or supplies required of students that contribute to the cost of the course.
Advanced Manufacturing
http://catalog.sierracollege.edu/departments/advanced-manufacturing/
...Welding of Mild Carbon Steel on Sheet and Plate WELD 0003A Gas Tungsten Arc Welding...
