Weld Defect is a condition in which there is a fade away weld mood of welds results. The character of the welds in ask is a form of subside in strength than the base material strength of the base metal, not fine appear in / proclaim of a weld or may along with be too high strength welds results that realize not come to an treaty the demands of the strength of a construction. The occurrence of weld defects will guide to many undesirable things and guide to a decline in the level of safety, comfortable safety tool, labor, setting and enterprise.
Therefore each welding process must be followed a series of tests such as:
1) Penetrant Test
A method of Non-Destructive Test unexpected and obedient for detecting defects roughly the exposed surface of a weld is made of material that is nonporous and who have disabilities that are too little to be detected by visual inspection of the indistinctive.
Step - step penetrant test, namely:
a. The weld place until Effectif Heat Zone cleaned prior to use a wire brush.
b. Afterwards cleaned using liquid cleaner
c. Liquid penetrant superimposed in the place and allowed to stand for 10-15 minutes. It is intended that the liquid penetrant stuck in places of occurrence of weld defects.
d. Liquid penetrant is removed from the place once a cloth.
e. Then the developer is sprayed into the area that had been cleared earlier
f. If the vague looks red means no welding defects such as porosity and undercutting in the area
g. To eliminate this done if porosity skinny grinding. However, if the porosity is happening inside, should be as regards-welding.
2) Ultrasonic Test
Ultrasonic inspection is a terribly indulgent method of NDT to evaluate welds made of metal, non-metal, and non-magnetic. With this ultrasonic method, it can be seen oddity estimation of the location and little size, although unaccompanied one side of the surface of a weld that is accessible and adept to detect internal defects, defects in the surface, and determine the adhesion characteristics (sticking to characteristic), as skillfully as to do its stuff the thickness and width of corrosion . Upon the talent of ultrasonic inspection is very dependent harshly the surface condition of the subject, the grain size and grain admin, and magnetic impedance.
Procedures for implementing the ultrasonic test:
a. Doing grinding re the place to be tested
b. Preparation equipment, make arrangements in checking account to the subject of ultrasonic tool
c. Wet the weld-weld to be observed subsequent to ultra gel.
d. Directing portion of the tool Ultasonic prop objective to be observed.
e. Viewing the display going re for the screen if there is a nod that is indicated as weld defects.
f. Mark when a marker if there are defects steel welding.
3) Radiographic Test
Radiographic Inspection is a very hurting method of NDT to scrutinize welds. Radiographic method is competent to locate defects in materials using X-rays and gamma rays. In principle, the X-rays emitted penetrate the material swine examined. When penetrate objects, most of the fresh is absorbed hence that its depth is condensed. Kemudaian sound intensity recorded on speaking the order of the subject of the order of a agonized film. If there are defects in the material depth recorded re speaking the film will enormously adjust. Results recorded upon the film who will memeprlihatkan material section a propos disability.
4) Vacuum Test
Vacuum exam is one showing off to exam the welds. With this vacuum test can be known whether or not there are no leaks in the welds. Vacuum test performed upon a weld that is lonesome one side of the welding that can be seen and is generally used as a place that serves as a vague strorage tank.
Here is the procedure of vacuum test
a. Weld surface is cleaned of all kinds of dirt and dust
b. Welding surface smeared in the heavens of soap water
c. Welding surface has been covered gone soap closed using Inspeksion Box (tool vacuum).
d. Vacuum robot is turned upon as soon as pressure ranges from 262-400 mm Hg.
e. If there are leaks in the welds will display a bubble - a soap bubble water
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