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WELD 0003B - Gas Tungsten Arc Welding (TIG) - Career Path

http://catalog.sierracollege.edu/course-outlines/weld-0003b/

Catalog Description Formerly known as WELD 50 Prerequisite: Completion of WELD 3A with grade of "C" or better Hours: 72 (18 lecture, 72 laboratory) Description: Covers equipment, metal preparation, and welding of stainless steels in all positions using Gas Tungsten Arc Welding. Instruction in equipment setup for different metals, filler selection, material identification, and welding techniques using Gas Tungsten Arc Welding. Students will learn to read and correctly complete welding procedures performed in industry. Helps prepare students for employment in high demand jobs. (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 process to perform student assignments. CSLO #2: Define terms related to this course; collet and collet body, tungsten, inert, alternating frequency, square wave output. CSLO #3: Develop, analyze and practice manipulative skills GTAW process with selected techniques on mild carbon and stainless steel sheet material with adjustments. 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   Intermediate Safety Topics Describe and compare all types of personal respiration safety devices. Identify & remediate hazardous fumes and particulate in processed and welded material, especially stainless steels Locate Safety Data Sheets and identify key health and environmental hazards such as hexavalent chromium Evaluate safety issues as they pertain to shop safety, industrial safety, and personal safety and apply appropriate safety Discuss and analyze correct safety practices when using the various types of welding or cutting equipment and general shop equipment such as grinders. Explain proper mitigation procedures for reducing and eliminating health hazards associated with welding stainless steels Assessing the weld puddle appearance to adjust Essential Variables During the Welding Process Identify when and how much each of the following parameters need adjustment based on weld puddle and bead appearance when welding stainless steel Wirefeed Speed and Voltage Contact Tip to Work Distance Direction of travel & travel angle Work Angle Travel Speed Electrode Manipulation Gas Selection and adjustment as applicable Understand what factors affect each of the afore mentioned parameters Set Up and Use Advanced Functions on GTAW Equipment  for Stainless Steel Make proper adjustments to the pulse function to produce quality weldments Make proper adjustments to high-frequency continuous mode Perform correct changes to Tungsten tip profile  Make proper adjustments to Pre-flow and Post-Flow Select correct cap size for proper gas coverage  Considerations for GTAW on Stainless Steel Discuss importance of cleaning and cross-contamination Analyze proper fit up, tacking sequences, and heat distortion issues Compare and contrast welding thin vs thick stainless steel Discuss electrode selection and polarity for welding on stainless steel Determine gas selection for GTAW on stainless steel List pros and cons of using GTAW to weld stainless steel Application of Welding Stainless Steel in Horizontal, Vertical, and Overhead Positions on thin and thick material Discuss, compare and contrast various welding techniques employed when welding in horizontal, vertical, and overhead positions Apply knowledge of welding in horizontal, vertical, and overhead positions to various joint types Bench Grinder, Bench Sander, Air Tool Safety and operation Identify key parts and safety features of bench grinder, bench sander, and/or various air tools Demonstrate safe use of bench grinder, bench sander, and/or various air tools List, then compare and contrast various abrasive wheels, discs, and pads and their uses. Select the correct abrasive for a given task and produce a quality finish Types of Stainless Steels Explain the differences between the following stainless steels and their common applications and welding considerations Austenitic Ferritic Martensitic Duplex Filler Metal and Material Specifications Describe the numbering system for stainless steel filler metals Use the numbering system to identify alloying elements in the filler metal Discuss  the effects of alloying elements in the weld metal Explain the difference between austenitic, ferritic, martensitic, and duplex stainless steel alloys Groove Weld Profiles and Acceptability Identify the parts of a groove weld Draw and label the following groove weld profiles in a butt joint Acceptable profile Insufficient size (underfill) Excessive convexity Undercut Overlap Slag inclusion Incomplete fusion Included porosity Cracks Label which 9 groove weld profiles are desired, acceptable, sometimes unacceptable, and always unacceptable based on severity of discontinuity Understanding Groove Weld Symbols Explain the difference between a “weld symbol” and a “welding symbol” Arrow /other side weld symbols Memorize the following groove weld symbols and their corresponding joint configurations Single Bevel Double Bevel Single J Double J Single V Double V Single U Double U Identify all possible combinations of each basic groove weld type and weld joint Butt Joint: square, bevel, double bevel, J, double J, V, Double V, U, Double U Tee Joint: square, bevel, double bevel, J, double J Lap Joint: square, bevel, double bevel, J, double J Corner Joint: square, bevel, double bevel, J, double J, U, V Edge Joint: square, bevel, J, U, V Understanding Groove Welding Symbols Interpret all aspects of a groove welding symbol (S) Depth of Bevel; Size or Strength of welds (E) Groove Weld Size (A) Groove Weld Angle (R) Root Opening Match welding symbol examples to their corresponding joint configuration design Discuss and analyze pros and cons of using each of these combinations on a variety of welding applications Discontinuities and Defects Associated with Gas Tungsten Arc Welding of Stainless Steels Carbide Precipitation (Sugaring) Undesirable weld profile Overlap Undercut. Underfill Over run Under run Cracks Porosity Lack of Fusion American Welding Society Specifications of Welding Positions by Degree Range Values Define rotation of face and inclination of axis Understand how rotation of face and inclination axis ranges and limits define welding positions for fillet and groove welds independently Create Resume and Cover Letter with welding experience listed 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. Perform the following Lab Assignments using GTAW on Mild Carbon Steel with ER-309 fill rod or on Stainless steel with ER-308 fill rod as available: 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 Objective Examinations Example: Examination on principles, application and knowledge of Gas Tungsten Arc Welding. Example: Explain the difference in conductivity between helium and argon gas. Projects Example: Student final manipulative assignment is project based (3G and 4G on 16 ga. MS and SS) and rubric grading. Skill Demonstrations Example: Student is evaluated based on American Welding Society acceptance criteria on visual appearance of welds for each assignment; for example, 1st stainless steel assignment of lap joint, tee joint and outside corner joint. Repeatable No Methods of Instruction Laboratory Lecture/Discussion Distance Learning Lab: With instructor's demonstration and oversight, students will apply various techniques to the material types to be welded, for example carbon steel. Following class lecture, video presentation, and lab demonstration, students are directed in the practice of manipulative skills in Gas Tungsten Arc Welding applications. Lecture: Lecture and interpersonal group discussion on the various applications of Gas Tungsten Arc welding processes followed by student presentations of group results. 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 the chapter in the text on the differences between modern Square wave and the Advanced Square wave GTAW machines and be prepared to discuss in class. Example: Silicon controlled rectifier vs. inverter technology. 2. The student will research subject matter of the topic assigned to him/her for presentation to the class. Example: Plasma effect of the Tungsten arc in inert gas. Writing, Problem Solving or Performance 1. Report from the reading assignments, the welding procedures and welding joint designs and visual acceptance criteria to welding code. 2. Demonstrate performing the skill sets of the various weld jobs assigned in lab assignments during each lab meeting. Example: TIG welding techniques in welding stainless. Other (Term projects, research papers, portfolios, etc.) 1. Students are required to complete a practical (hands on lab) final assignment. Additionally, each student is assigned to a group presentation. Each group presents orally one of the various types of Tungsten electrode alloys. 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.