logging in or signing up VIPUL HADIYA PPT welding metllurgy aSGuest65597 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 137 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: September 09, 2010 This Presentation is Public Favorites: 1 Presentation Description No description available. Comments Posting comment... By: myousri (14 month(s) ago) i need this topic Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript VIPUL HADIYAV-SEMFABRICATION TECHNOLOGYSF-503WELDING METALLURGY : VIPUL HADIYAV-SEMFABRICATION TECHNOLOGYSF-503WELDING METALLURGY TOPIC:-2 : TOPIC:-2 BASIC CONCEPT & PHYSICAL METALLURGY OF WELDING . SUB TOPIC:- ENERGY INPUT AND DISTRIBUTION. DISSIPATIO OF WELDING HEAT. INDEX : INDEX ENERGY INPUT AND DISTRIBUTION. DISSIPATIO OF WELDING HEAT. ENERGY INPUT AND DISTRIBUTION. : ENERGY INPUT AND DISTRIBUTION. The energy supplied by the welding arc in a fusion welding process. It is called arc energy and is calculated from current, voltage and welding speed. ENERGY INPUT AND DISTRIBUTION. : ENERGY INPUT AND DISTRIBUTION. How ever, all the arc energy is not utilized for welding. Some of it is invariably lost, as shown in figure. ENERGY INPUT AND DISTRIBUTION. : ENERGY INPUT AND DISTRIBUTION. Continue.. : Continue.. The extent of energy loss varies with the welding process, welding parameter, preheat temperature, etc.. To account for the energy loss and estimate the actual energy given to the work piece. Continue.. : Continue.. A term known as heat input is employed. The heat input of a single pass weld is calculated by multiplying the efficiency of the welding process and arc energy. Continue.. : Continue.. Table list some typical energy transfer efficiencies of various welding processes. Table : Table Table : Table Table : Table Table : Table Table : Table Continue.. : Continue.. The efficiency is not invariant with arc energy and decreases with arc energy as shown in fig. Continue.. : Continue.. Continue.. : Continue.. There for, heat input at best can serve as a rough guide to the amount of heat supplied to the work piece. Continue.. : Continue.. The heat supplied to a work piece also depends on the distribution of energy density of the arc as shown in fig. for a tungsten arc. Continue.. : Continue.. Continue.. : Continue.. The power density distribution decides the weld bead characteristics such as penetration. In the case of GTAW, vertex angle of the conical tip of the tungsten electrode influences the weld depth to width ratio. Continue.. : Continue.. The presence of certain impurity elements in materials and the nature of the shielding gas also have critical influence on the weld bead penetration. DISSIPATIO OF WELDING HEAT. : DISSIPATIO OF WELDING HEAT. The energy applied to create a weld joint is dissipated by conduction to the base metal. Welding fixture and the environment. DISSIPATIO OF WELDING HEAT. : DISSIPATIO OF WELDING HEAT. The imposition of welding thermal cycle on the base material cause change in the property of the HAZ. A welding thermal cycle is characterized by heating rate, peak temperature and cooling rate. DISSIPATIO OF WELDING HEAT. : DISSIPATIO OF WELDING HEAT. Fig, presents a typical family of thermal cycle for arc welding . DISSIPATIO OF WELDING HEAT. : DISSIPATIO OF WELDING HEAT. The following three characteristics are apparent. Peak temperature decreases rapidly with the increasing distance from the weld centre line. Continue.. : Continue.. 2. Time required to reach peak temperature increase with increase distance from the weld centre line. 3. Rates of heating and cooling decrees with increasing distance from the weld centre line. Slide 27: THANK YOU ! You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
VIPUL HADIYA PPT welding metllurgy aSGuest65597 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 137 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: September 09, 2010 This Presentation is Public Favorites: 1 Presentation Description No description available. Comments Posting comment... By: myousri (14 month(s) ago) i need this topic Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript VIPUL HADIYAV-SEMFABRICATION TECHNOLOGYSF-503WELDING METALLURGY : VIPUL HADIYAV-SEMFABRICATION TECHNOLOGYSF-503WELDING METALLURGY TOPIC:-2 : TOPIC:-2 BASIC CONCEPT & PHYSICAL METALLURGY OF WELDING . SUB TOPIC:- ENERGY INPUT AND DISTRIBUTION. DISSIPATIO OF WELDING HEAT. INDEX : INDEX ENERGY INPUT AND DISTRIBUTION. DISSIPATIO OF WELDING HEAT. ENERGY INPUT AND DISTRIBUTION. : ENERGY INPUT AND DISTRIBUTION. The energy supplied by the welding arc in a fusion welding process. It is called arc energy and is calculated from current, voltage and welding speed. ENERGY INPUT AND DISTRIBUTION. : ENERGY INPUT AND DISTRIBUTION. How ever, all the arc energy is not utilized for welding. Some of it is invariably lost, as shown in figure. ENERGY INPUT AND DISTRIBUTION. : ENERGY INPUT AND DISTRIBUTION. Continue.. : Continue.. The extent of energy loss varies with the welding process, welding parameter, preheat temperature, etc.. To account for the energy loss and estimate the actual energy given to the work piece. Continue.. : Continue.. A term known as heat input is employed. The heat input of a single pass weld is calculated by multiplying the efficiency of the welding process and arc energy. Continue.. : Continue.. Table list some typical energy transfer efficiencies of various welding processes. Table : Table Table : Table Table : Table Table : Table Table : Table Continue.. : Continue.. The efficiency is not invariant with arc energy and decreases with arc energy as shown in fig. Continue.. : Continue.. Continue.. : Continue.. There for, heat input at best can serve as a rough guide to the amount of heat supplied to the work piece. Continue.. : Continue.. The heat supplied to a work piece also depends on the distribution of energy density of the arc as shown in fig. for a tungsten arc. Continue.. : Continue.. Continue.. : Continue.. The power density distribution decides the weld bead characteristics such as penetration. In the case of GTAW, vertex angle of the conical tip of the tungsten electrode influences the weld depth to width ratio. Continue.. : Continue.. The presence of certain impurity elements in materials and the nature of the shielding gas also have critical influence on the weld bead penetration. DISSIPATIO OF WELDING HEAT. : DISSIPATIO OF WELDING HEAT. The energy applied to create a weld joint is dissipated by conduction to the base metal. Welding fixture and the environment. DISSIPATIO OF WELDING HEAT. : DISSIPATIO OF WELDING HEAT. The imposition of welding thermal cycle on the base material cause change in the property of the HAZ. A welding thermal cycle is characterized by heating rate, peak temperature and cooling rate. DISSIPATIO OF WELDING HEAT. : DISSIPATIO OF WELDING HEAT. Fig, presents a typical family of thermal cycle for arc welding . DISSIPATIO OF WELDING HEAT. : DISSIPATIO OF WELDING HEAT. The following three characteristics are apparent. Peak temperature decreases rapidly with the increasing distance from the weld centre line. Continue.. : Continue.. 2. Time required to reach peak temperature increase with increase distance from the weld centre line. 3. Rates of heating and cooling decrees with increasing distance from the weld centre line. Slide 27: THANK YOU !