Best Welding Testing In New Zealand: What You Need To Know
Welding tests are a valuable asset to any manufacturing or construction company. You can use them to test new products and processes, check for defects, and get an idea of how long your equipment will last before it needs maintenance. While most companies conduct simple visual checks of welds, some are so paranoid about making sure their procedures are perfect that they have special testing equipment for this purpose.
Here we’ll explore the different types of welding testing in New Zealand, what each type involves, and its benefits.
How does Welding Testing work?
When welding two metals together, the weld occurs when the joint is cooled, hardened, and then heat-treated. If the weld is not sound enough to withstand the rigors of everyday use, then it will break. A welding test is used to examine the weld joint visually, with a microscope to look for imperfections, and with equipment that measures the weld’s strength, ductility and toughness. Each type of welding test is used to look for different things and is performed on a range of equipment. Let’s take a look at some common welding types and what they look for.
Types of Welding Testing
Welding tests are actually divided into two types: static and fatigue testing. Static welding tests look for defects in the weld joint area. They also examine weld composition to ensure there aren’t any foreign materials mixed in. Fatigue tests look for defects in the weld joint caused by repeated impact. They also determine if the weld joint can withstand repeated impact without damage.
Welding Test Equipment
When it comes to welding testing in NZ, there are two main types of equipment you’ll come across: manual and automated welding machines. Manual welding machines are usually large and manned by a welder who performs the test. This is the most common type of welding equipment, and it’s used in many welding shops and production lines. Electronic welding machines can be large or small, operated manually or by an automated welding controller. These welding machines are automated welding control equipment, so they perform welding tests with high accuracy and speed. They’re also controlled by welding controllers, which are used to operate the equipment and make adjustments.
What Welding Tests Look For In A Welder?
Different welding test equipment is used for different testing types, and each one has a different set of things to look for in a welder.
Visual inspection - This is the most basic part of most welding tests, and it’s usually done by a welder who inspects the weld joint visually. To do this, you need to inspect the weld joint area for any visual defects, like cracks or voids, and make sure the weld is sound and meets your specifications. Visual inspection can also be done by a welder who’s not part of the test. This is often done by a shop manager who’s checking to see if employees are welding properly. A visual inspection can be done with the welder wearing safety glasses and a mask, to examine the weld for any defects that are too small to be detected by the naked eye.
Microscopic inspection - This is done with a microscope, to examine the weld for any defects or flaws. There is a range of equipment used for microscopic inspections, with different features depending on the type of weld being inspected.
Ductility testing - This test is used to assess the weld joint’s bending properties. A bend test machine uses weight and force to deform the weld joint, and the strength of the joint is determined by the resistance to this force. In a bend test, the joints are usually tested at various angles of bend, followed by a straightening force. A weld joint that can withstand the bending forces without breaking is ductile, so ductility testing is used to find these welds, while a weld with low ductility is likely to fracture when subjected to bending forces.
Toughness testing - This test is used to determine the weld joint’s resistance to impact. A machine is used, and the weld joint is either dropped or hit against a hard surface, and the weld’s resistance to this impact is determined by the damage and whether it holds up the test. Welds with low toughness are likely to be fractured by a hard impact, while welds with high toughness can take repeated impacts without damage.
How To Conduct Welding Testing?
Welding tests are usually performed on a lab or production weld, and this is usually done by a welding inspector who checks for defects and assesses the weld’s strength, ductility, and toughness.
Laboratory weld testing - This is usually done in a lab setting, with a number of different welds being tested simultaneously. The welding inspector will use a range of equipment to examine the weld joint area, including microscopes and visual inspection equipment. They’ll also use instruments to measure the weld joint’s ductility, toughness, and strength.
Production weld testing - This is usually done on a shop floor, with a production weld inspector who’s examining the weld joint area and strength. The inspector will also use a range of testing equipment to determine the weld’s ductility and toughness, as well as inspect the weld for any defects.
Benefits of Welding Testing
- Welding tests are useful for inspecting welds to see if they’re defective, performing inspection on the weld joint area, and checking the weld’s ductility and toughness.
- Testing welds on a lab or production weld can help you identify defective welds, as defects on these welds are usually more obvious than defects on field welds.
- Weld test results help you identify weak welds and defects, which means you can repair these welds and make them stronger before they break.
- You can also use testing equipment to perform energy analysis and thermal analysis on welded joints to see how much energy the weld has absorbed.
Disadvantages of Welding Testing
- Welding tests are time-consuming and costly, so they’re performed on only the most important welds.
- The results of welding tests are often subjective, so they can be misinterpreted by weld inspectors.
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