Control of Welding

This paper deals with the control of weld depth penetration for cylinders in gold-nickel alloy and tantalum. After introducing the experimental set-up and the samples description, the study and the optimization of the testing are presented for single-sided measurements either in a pulse-echo configuration or when the pump and the probe laser beams are shifted (influence of a thermal phenomenon), and for different kind of laser impact (a line or a circular spot). First, the ultrasonic system is used to detect and to size a flat bottom hole in an aluminium plate. Indeed, when the width of the hole is reduced, its shape is nearly similar to the one of a slot. Then, the optimization is accomplished for... 

Aittomated pracesKS use close control of welding parametera such as current ower, weld speed, an lengA, etc. 

Welding Defects Visual, radiographic and/or ultrasonic Indications. Any welded joints. Basic welding problem laminated steel can cause trouble. Electrode manipulation. Control of welding speeds, procedures, careful inspection and nondestructive testing to locate defects for cutting out or repair. 

Examination of welds must be conducted by NDE personnel. Chapter GR-4 applies. The following examination and tests for quality control of welds on hydrogen pipeline systems must be conducted ... 

Control of welding speeds, procedures, careful inspection and nondestructive testing to locate defects for cutting out or repair. 

With procedures of this type no control of weld bead size is normally necessary. However, when conditions are severe (for example, high carbon content, thick plate, or high restraint levels) there is some advantage in producing relatively small beads. These require little time at the interpass temperature for much of their... 

Leak caused by manufacture defect occurred just after cold trap has been installed in the primary circuit. Sodium leaked through the micro crack in the weld on the nozzle of the trap as a result of sodium heating in the pipeline. The cause of the leak was improper control of welds after installation of the cold trap. Such leaks are revealed just after putting into operation of the failed element of the system. 

Leaks caused by low quality control of welds after installation were detected immediately after putting into operation of failed system element. 

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