Weld test plate

In categorizing the various weld types, it is possible to separate these types by the time periods in which they were used. C-E qualified each particular combination of weld wire and flux lot at least one time before using a specific heat of weld material. After receiving welding wire and flux material from the suppliers, a weld test plate was prepared which used the specific combination of a heat of wire and lot of flux. This test plate was analyzed chemically and mechanically to assure compliance with all required... 

Fig. 13-8. Weld test plate design showing method of obtaining specimen.

Weld test plates of the type shown in Fig. 13-8 have also been used for studying the mechanical properties of welded joints. Such test plates were side-bend tested in the apparatus illustrated in Fig. 13-10. The results of the tests, presented in Table 13-3, indicate excellent weld metal ductility. For example, the ductility of heat M-5 material is greater than 40% at temperatures un to and including 1500°F. 

The evaluation and demonstration of this weldi ng technique was accomplished in three phases evaluation and optimization of ten major expl welding variables (plate material, plate thickness, explosive quantity standoff, plate surface, plate deformation, mechanical shock, metal grain orientation, weld length, and expl residual), the development of four welu joints, and an a fplicationai analysis which included photomicrographs, pressure integrity tests, vacuum effects, and fabrication of some potentially useful structures in aluminum and titanium... 

Figure 4.1 (a) Atlas test components, (b) Atlas Cell (ASTM C868) assembly, (c) Atlas cell panel with T-weld in the sheet liner, (d) Schematic of the Atlas cell used for laboratory screening with a blind flange lined with the candidate material (1) condensation column, (2) Atlas cell, (3) thermometer, (4) heater sheath, (5) text medium, and (6) coated test plate. (Courtesy DuPont Engineering Technoiogy.)... 

The requirements for obtaining the desired notch toughness in weld metal are more comprehensive. Impact tests are required on the weld metal of procedure qualification test plates for all... 

CIT is a destructive test that utilizes test specimens machined from actual production test plates or sample materials. The test specimens can be machined for impact testing of all base metal, aU weld metal or the heat affected zone (HAZ). Weld samples can be taken from the root area or any other specific area of the weld metal. 

The material used for this study was in.-thick, mill production, 5083-H113 plate. The -H113 temper was chosen for study because it is a much stronger temper than the annealed -0 temper. It was felt that the -0 temper would be-at least equivalent to the -H113 temper in its resistance to brittle fracture. Three-quarter-inch plate was chosen because it is representative of the majority of 5083 heavy plate. Furthermore, it required multiple pass welding, typical of field welding procedures. The composition of the 5083 test plate and the specification composition limits for alloy 5083 and for the weld filler alloy 5183 are given in Table II. 

The energy absorbed by the tests transverse to the welds was lower than for the plate tests. This is largely accounted for by the lower flow stresses and the localization of deformation in the weld deposit. The energy absorbed in the weld tests did increase with decreasing temperature at about the same relative rate as in the plate tests. 

The thickness of the test plate used in making the welding procedure qualification of section IX should not be less than that of the material to be welded. 

Six designs for laser-welding tubes to plates are presented, with test data indicating that the first three can produce leak-free welds. Tests are underway for the remaining three, and a preliminary angle study indicates that there is reason to expect that they too will be successful. 

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... 

Special contact transducers having wedges providing incidence angles for specific appHcations are used widely in industry. For example, normal incidence is used in tests for laminations within sheets, and for sheet or plate thickness where the back surface of the test material parallels, to within perhaps 10°, the front surface. Shear wave transducers typically used for weld examination have 45°, 60°, or 70° inspection (refracted) angles. To locate discontinuities, the transducers may be moved back and forth over selected surface areas until the angled search beam approaches normal incidence on the... 

In this study, an integrated methanol reformer including an evaporator and a combustor was fabricated and tested. Previous tests of the reformer with a number of on-off cycles revealed that non-uniform temperature distribution caused hot spots within the combustion plate, resulting in cracking of the welded region of the reformer. Therefore, emphasis was made to achieve a uniform temperature distribution within the reformer. In addition, start-up characteristics of the complete reforming system were investigated. 

Category 1 the highest class, requires 100 per cent non-destructive testing (NDT) of the welds and allows the use of all materials covered by the standard, with no restriction on the plate thickness. 

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