G6 Welding Test
Amabella Batton
In this article we will learn more about welding tests and what they are performed on our products and systems. Welding is an important process in various industries. Weld quality affects the structural integrity of systems. Therefore, various test methods are used to inspect welds.
As mentioned earlier, welding affects the safety of the system. Quality welding is the backbone of reliable structural integrity. Even one weak weld can yield catastrophic consequences. That is why engineers use various testing methods. Welding tests serve several crucial purposes, including:
Visual inspection is the most basic testing. A certified inspector checks for cracks, porosity, or incomplete penetration. Some of the most sought-after certifications are from AWS (American Welding Society) or ASNT (American Society for Nondestructive Testing).
RT uses X-rays or gamma rays to create an image of the internal structure of a weld. This method is very important for detecting internal defects. While it allows for a comprehensive inspection, it requires special equipment.
ET testing uses electromagnetic induction to detect flaws in welds. ET can detect cracks, corrosion, wear, and lack of fusion. It is very useful to detect defects in non-ferous materials and it can also measure thickness.
The testing methods mentioned so far are non-destructive. Meaning, the base material is not damaged during the test. Sometimes a more thorough inspection is required. The following testing methods are called destructive testing methods. In certain areas, they provide more detailed information about the welding at the cost of damaging the material.
Earning a specialized welding certification can reward you with higher salary potential, stronger employment demand, and better job stability. A specialized certification displays your commitment to professional growth which can lead to success as an industry expert and leader.
You can now upload a PDF copy of your Maintenance of Welder Certification application and pay your renewal fees using the new online portal. The new online portal improves your certification(s) processing time while also providing a convenient and secure payment option.
CWIs determine if a weldment meets acceptance criteria, handle qualification records, oversee non-destructive testing, and ensure proper materials are available during testing. The AWS Certified Welding Inspector credential is one of the welding industry's most recognized certifications. In fact, CWIs are highly regarded and sought after throughout the welding industry.
The CWE Program was developed for welding industry professionals who seek to demonstrate the necessary skills, knowledge, and experience to direct and perform operations associated with welder training and classroom instruction.
The CRWT credential is a benchmark for the evaluation of demonstrated skills and abilities in resistance welding principles, processes, and equipment through a combination of education, experience, and examination.
The CRAW certification program allows operators and technicians in various welding sectors to measure themselves against occupational standards and signifies their capability of working with various codes, standards, and specifications.
Welding Sales Representatives are the conduit between manufacturers and distributors and their customer base. The CWSR credential indicates an individual is a valued source of technological, welding product, and sales distribution information.
The CAWI credential was developed for young professionals who aspire to a career in welding inspection but still need to meet the minimum work experience requirement to become a Certified Welding Inspector (CWI).
Today AWS is proud to say that our influence spans the globe, and we support thousands of welding professionals worldwide. To assist our international members, AWS contracts with organizations in countries throughout the globe to facilitate certification exams.
For information about the COVID-19 global outbreak and for Great Falls College MSU updates, please visit the CDC website, the Great Falls College COVID-19 page and the Great Falls College Healthy Spring 2021 page.
The Accredited Test Facility program establishes minimum requirements for test facilities, their personnel and equipment to qualify for accreditation to test and qualify welders, utilizing Great Falls College's state-of-the-art welding shop as its testing facility.
The weld test methods listed below are greatly specialized, requiring skill and aptitude. These tests check the skill of the welding mechanic along with the quality of the weld metal and the strength of the welded joint for each variety of the metal used in industries.
An error in the welding process may damage weld metals significantly resulting in the loss of strength, durability, and failure of the structure. These welding testing methods like visuals inspection and others are an assurance that products are secure for the intended use.
The aim of these tests is the examination of the weld without imparting any damage. These may include x-rays, hydrostatic tests, etc, and are also termed NDE or nondestructive examination and NDI or nondestructive inspection.
This physical weld testing is employed to ascertain the soundness of the weld. The acid attacks the edge of the defects in base metal or weld metal and identifies the weld defects. In the condition of the defect, the boundary becomes accentuated between base and weld metals and can define the defect clearly which is otherwise not visible to the naked eye. This test is performed along the cross-section of the weld joint.
The requirement of this test is fulfilled by bending the specimens at 180 degrees and is now accepted as passable. No, a crack more than 3.2mm in any dimension should be visible on the surface. Face bend tests are made in the jig while facing the weld in tension means outside of the bend. Now the root bend test is made in the jig with the face of the weld in tension as on the outside of the bend. The guided bend tests are shown in the figure.
This physical weld-free bend testing approach is designed to judge the ductility of the metal deposited in a weld joint. The specimen for this testing is procured by machining from the welded plate with the weld that came across as shown in A, figure.
The test sample bent, in the beginning, is placed in a machine that is capable of exerting a big compressive force and bent continually until a crack is more than 1/16 inches in any dimension seen on the face of the weld. In the condition of no crack, bending may be continued till the sample is 1/4 inches thick or under may be possible to test in a vise. The heavy plate is usually tested in bending jigs or a press.
You may use a power compression press or vise when doing the free bend test, it is better to machine the upper as well as the lower plate of the bending devices to present surfaces parallel to the ends of the test sample. This exercise will prevent the slipping and snapping of the specimen out of the testing equipment when it is bending.
Once the bend test is concluded after bending the test specimen, the distance between the scribed lines is measured in inches and recorded as distance Y. To calculate the percentage of elongation, subtract the figure X from Y distance, divide it by Xor initial distance and multiply by 100. Usually, the requirement for passing this test is minimum elongation by 15% and no crack bigger than 1/16 inches in any dimension happens on the face of the weld.
This is a physical weld testing designed to ascertain the quality of the weld metal and the extent of penetration into the root of Y of the butt joint after welding. The sample or specimen used for testing is similar to the free bend test except they are bent with the root of the weld towards the tension side, or outside. The tested specimens need to bend 90 degrees without breaking away. This physical test is broadly replaced with a guided bend test.
This break test has been devised to detect in weld metal of the welded butt joint any internal defects like slag inclusions, poor fusion, gas pockets, oxidized metal, and burnt metal. Procure the sample from the welded joint by either machining or cutting by oxy-acetylene torch. Every edge of the joint is given a slot by a saw cut through the center. The prepared piece of the specimen is bridged across the two steel blocks. Now stuck the sample with a heavy hammer until the section of the weld between slots gets fractured.
The metal which is exposed needs to be completely fused and free from slag inclusions. Gas pockets if any should never be more than 1.6mm across the higher dimension, The number of gas pockets should not exceed 6.
To judge the soundness of the fillet welds another break test method is employed which is called as Fillet Weld Break Test. Here the force is applied with the press, hammer blow, and testing machine pressure applied to the apex of the V-shaped specimen until the fillet weld breaks away. Now examine the surface of the fracture for the soundness of the welding.
The tensile strength test is designed to test the strength of the welded joint. A segment of the, to be tested, the welded plate is placed the weld midway in the jaws of the testing machine. The width and thickness of the test sample are measured before the testing. To calculate the area in square inches multiply this before testing, and calculated by multiplying these 2 figures as in the formula of Figure.
The specimen for the tensile physical weld strength test is now mounted on a machine that will exert enough pulling force to break the sample. The machine for testing may be portable or stationary type. A portable testing machine working on a hydraulic principle that is enough to pull and bend the specimen is shown in Figure.
While testing is being performed on this machine the load in the pound is visible on the gauge. The stationary-type machine shows the load applied on the balancing beam. In every case, the load is recorded at the point of breaking. The specimens broken by the tensile strength test are shown in Figure.
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