Modular Fixture Design for BIW Lines Using Process Simulate® .. Tapping, Testing, Turning, Welding, Robotic Spot Welding, Robotic Painting. BIW WELDING FIXTURE UNIT BIW welding fixtures are used for holding the sheet metal or part assembly together in space while the components are. BIW Fixture Design solution: HRT provides service solutions with top quality for BIW Welding Fixtures in Automotive Industry. We provide complete BIW Fixture.

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Skip to main content. Log In Sign Up. So, designing a fixture in this plane is often a complex fixturea, considering the we,ding in coordinate systems and basic rules such as maintaining few elements in specific orientations. There is deformation of body assembly due to the welding process effect and resulting variation due to part dimensional variation, when you are designing a fixture you should eliminate them and another objective is achieving body quality within the required tolerances, so you can achieve this purpose by planning location layout.

Location layout is the selection of the positions and numbers of locators and clamps for assembly of fixture components into a final configuration on a fixture base.

Designing a welding fixture is based on the location layout.

It involves numbers of fixture units and due to the complexity and shape bw the component geometry, the choice of elements as well as configuration of each unit tends to change from case to case.


Fixture bid to hold the body parts securely and composed of following item: The body part is constrained by a set of appropriately locating pin so total constraint by locating pin should be fully constrained at all times to prevent any movement. Usually two locating pins are enough to properly locate the body part on one plane.

BIW Welding Fixture Design

One of the pins is round, and another one is diamond shaped. This configuration will allow easier loading of body part. The end of each pin has a round or conical shape or is chamfered for the purpose of maintaining workability such as ease of loading and quality such as prevention of damage.

The taper lead angle is large, 60 degrees or less, for small-size body parts and manual operation, but it is frequently between10 and 30 degrees for large-size body parts that are difficult to handle. The difference between the locate hole in the panel or body part and the locating pin diameter should be 0.

BIW Fixture Design solution

The dimension from the panel to the locating pin leading end straight area should be 5 mm. Locating pins are available in numerous shapes and sizes in a design. There are two configurations for position of locating pin: This is usually done with the datum surfaces that are reference for locating surface. The dimensions of datum fidtures are decided by selecting a necessary cross- section from the part drawing.

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The shape of locating surface is a form of cross-section of panel. Locating surface is configured to receive panel for setting in a correct position and locating a body part from any surface such as flat, curved, or have an irregular contour.


In most applications, locating surface devices locate a panel by its external flat surfaces and flat area, such as: Clamping device In every welding operation for body assembly, clamping of panel is an essential requirement. A clamp can be defined as a device for providing an invariant location with respect to an external loading system.

BIW Welding Fixture

In other words a clamp is a force-actuating mechanism of a fixture unit. The forces exerted by the clamps hold a panel securely in the fixture against all other external forces. When a welding process is producing a load or moment on the body part, it is necessary that a sufficient clamping force must be exerted to withstand welxing actions.

The generalized requirements of clamping device can be summarized as: The surface of base should be flat smooth and the base should be rigid enough for easy welding and machining.

The framework of the base is usually made of shape steel.

Load condition and configuration are not uniform, so it is impossible to set a base shape in general. Remember me on this computer.

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