# How to constraint a weld fillet?

**URL:** <https://prepomax.discourse.group/t/how-to-constraint-a-weld-fillet/3383>\
**Category:** General Questions\
**Created:** [March 30, 2026, 4:31pm UTC](https://prepomax.discourse.group/t/how-to-constraint-a-weld-fillet/3383 "2026-03-30T16:31:54Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![LePinho](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/lepinho/32/7502_2.png) [@LePinho](https://prepomax.discourse.group/u/LePinho)\
**Post date:** [March 30, 2026, 4:31pm UTC](https://prepomax.discourse.group/t/how-to-constraint-a-weld-fillet/3383/1 "2026-03-30T16:31:54Z")

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Hello

I’m having trouble simulating a weld fillet between two sheets. I set a “Tie constraint” between the faces of the sheet and the edges of the weld (faces as the master and weld as the slave), but when I run the analysis, the parts fly off as if they weren’t connected.

What should I do?

 ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/b/b17424de578afccff140a0a1516086def419549f.png)

> **[Weld filete - Google Drive](https://drive.google.com/drive/folders/1abe-bN8lbEylG9AzhjoZV8_SJfPOJhrD?usp=drive_link)**

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**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\
**Post date:** [March 30, 2026, 4:42pm UTC](https://prepomax.discourse.group/t/how-to-constraint-a-weld-fillet/3383/2 "2026-03-30T16:42:40Z")

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Tie constraint searches for the closest nodes within the search distance specified as position tolerance. It’s often necessary to increase it (while disabling adjustment to avoid negative jacobians) if the meshes are far from being compatible and have nodes spread further away on both surfaces.

 ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/f/f89b3286f676a9e4f08f92ea219cdc59f9feaf28.png)

Run a frequency step to make sure tie constraint works as expected.

In this case, the best way would be to partition the plates to get lines (and thus nodes) where welds are attached:

 ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/8/880612efcd129a93fa54bcf153b4528e97bc5e7e.png)

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<div class="post-metadata">

**Author:** ![LePinho](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/lepinho/32/7502_2.png) [@LePinho](https://prepomax.discourse.group/u/LePinho)\
**Post date:** [March 30, 2026, 4:51pm UTC](https://prepomax.discourse.group/t/how-to-constraint-a-weld-fillet/3383/3 "2026-03-30T16:51:04Z")

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Setting “adjust” to “No” worked quite good. Thank you

 ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/e/e1021370f73c74624c59582993e30a522409899e.jpeg)