IIW 2012 - 24

Commemorative Magazine

IIW International Conference 2012 - Abstracts

Fig. 2 Fusion interface of RENE80 deposition and GTD111 substrate, indicating an epitaxial growth (top). The directional growth can be maintained throughout multiple layers of deposition (bottom). The fissures were found mostly at the weld toes, where a deposit bead overlaps the previous deposit. Geometric discontinuity and formation of stray grains were found to contribute significantly to the formation of microfissures at the weld toes. With optimized processes parameters, crack-free, multiple-layers, deposits were achieved for tip repair (top-down orientation) of GTD-111 buckets with RENÉ 80 and IN625 filler metals. To provide insight on stray grain and microfissure formation as a function of thermal gradients and stress levels that are controlled by the process parameters, we developed a 3-D coupled-field thermomechanical model for pulsed laser powder deposition. The model successfully predicted the conditions for stray grain and microfissure formation. Furthermore, the experimental observation that the 25% transverse overlap produced the optimum resistance to crack formation has been verified by the theoretical analysis (Fig. 3).

Fig. 3 The numerical model predicted that the upper left quadrant is the most likely region to form microfissures (top). The 25% transverse overlap is predicted to be most resistant to cracking (bottom).

Paper 3: Advances in Automated Tube & Pipe Repair Welding
By: Robert Tollett, Liburdi Automation Inc., Canada Abstract: Automated Tube & Pipe welding started in California in the late 1960’s. Automated tube welding was the first process to be exploited by the then burgeoning semiconductor industry of the famous Silicon Valley companies. Texas Instruments and a host of others needed a way to weld tiny stainless fittings on IC boards and wafer fab chips. Tri Tool was one of the first companies to emerge as an automation house for the semiconductor industry. Tri Tool owners at the time formed a “holy trinity” of the orbital world; Mr. Mayfield went on to form Dimetrics with Howard Slecher under the ownership of Avon Corp. (Avon cosmetics). From simple TIG (GTAW) micro fittings, heads and designs grew three companies: Astro Arc, Arc Machines and Dimetrics. All three companies were located in California and represented the epicentre of tube welding. Pipe
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65TH IIW Annual Assembly & International Conference



IIW 2012

Table of Contents for the Digital Edition of IIW 2012

IIW 2012
Contents
Welcome Message
Annual Assembly Location
Colorado
Denver
General Information
IIW 65th Annual Assembly
IIW International Conference 2012 - Program
IIW International Conference 2012 - Abstracts
Speaker Bio Information
Smartphone App
Social Program
Technical Visits
Social Tours
Tour Schedule
Advertising Sponsor Profiles
Commission XIII Fracture Mechanics Seminar
IIW 2012 Sponsors
IIW 2012 - IIW 2012
IIW 2012 - Cover2
IIW 2012 - Contents
IIW 2012 - Welcome Message
IIW 2012 - 3
IIW 2012 - Annual Assembly Location
IIW 2012 - 5
IIW 2012 - Colorado
IIW 2012 - 7
IIW 2012 - Denver
IIW 2012 - 9
IIW 2012 - General Information
IIW 2012 - 11
IIW 2012 - 12
IIW 2012 - IIW 65th Annual Assembly
IIW 2012 - 14
IIW 2012 - 15
IIW 2012 - IIW International Conference 2012 - Program
IIW 2012 - 17
IIW 2012 - 18
IIW 2012 - 19
IIW 2012 - IIW International Conference 2012 - Abstracts
IIW 2012 - 21
IIW 2012 - 22
IIW 2012 - 23
IIW 2012 - 24
IIW 2012 - 25
IIW 2012 - 26
IIW 2012 - 27
IIW 2012 - 28
IIW 2012 - 29
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IIW 2012 - 31
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IIW 2012 - 35
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IIW 2012 - 37
IIW 2012 - 38
IIW 2012 - Speaker Bio Information
IIW 2012 - 40
IIW 2012 - 41
IIW 2012 - 42
IIW 2012 - 43
IIW 2012 - 44
IIW 2012 - 45
IIW 2012 - 46
IIW 2012 - 47
IIW 2012 - Smartphone App
IIW 2012 - Social Program
IIW 2012 - Technical Visits
IIW 2012 - 51
IIW 2012 - Social Tours
IIW 2012 - 53
IIW 2012 - 54
IIW 2012 - Tour Schedule
IIW 2012 - Advertising Sponsor Profiles
IIW 2012 - 57
IIW 2012 - 58
IIW 2012 - 59
IIW 2012 - 60
IIW 2012 - Commission XIII Fracture Mechanics Seminar
IIW 2012 - IIW 2012 Sponsors
IIW 2012 - 63
IIW 2012 - 64
IIW 2012 - Cover3
IIW 2012 - Cover4
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