In the production of cars, welds are tested in two ways: ultrasonic (at each weld) and destructive (random). Based on years of experience in spreading systems, Holmatro has developed an industrial hydraulic spreading system, called HATS (Holmatro Automotive Testing System), specifically for destructive testing in the automotive production sector.
In ultrasonic testing, it is difficult to interpret the readings and to define when a discontinuity is unacceptable. With the Holmatro Automitive Testing Spreader (HATS) it is easy to determine the actual quality of the welds by testing them destructively. Step 1: Determine the access point. Step 2: spread the metal plates. Step 3: check the welds. The material around the weld should tear (break), not the weld itself.
Types of Tools
Hydraulic shears are used for cutting materials, especially suitable for metals. The shears are closed by means of a hydraulic cylinder fed by a pump. The two blades of the scissors are made of hardened steel and have enough force to cut most car parts.
A spreader consists of two parts that can either move towards or away from each other, so it can spread and squeeze. A spreader can be used to press parts apart to make space or tear metal. By clamping a spreader on an object a lever is created with which the object can be bent or moved. By attaching chains to the ends of the spreader a spreader can also provide traction.
A ram is a hydraulic cylinder that is used to push parts apart. A ram works in one straight line and delivers mainly compressive force. Most rams are not built to deliver tensile force.
Rams may also consist of multiple cylinders or may be telescopically constructed to increase the working length.