---
title: "Modular Expansion Joint Systems: How can back gouging be performed in the field down the vertical face of the center beams with minimal clearance between the rails?"
description: "Steelflex® Modular Expansion Joint Systems are highly\nengineered assemblies which consist of Steelflex® centerbeams and edge beams."
---
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# Modular Expansion Joint Systems: How can back gouging be performed in the field down the vertical face of the center beams with minimal clearance between the rails?
## Steelflex® Modular Expansion Joint Systems are highly engineered assemblies which consist of Steelflex® centerbeams and edge beams.
**Answer**: Back gouging is required due to the full penetration groove weld requirement on the center beams. This can be done with either a grinder or air-arcing, depending on accessibility. Accessibility can be increased by using portable hydraulic jacks to move the centerbeams sideways, and then by using wooden blocks to maintain the increased gap where working. After welding a few passes on the first side, back gouge from the second side to sound metal.
###  **Learn more about Expansion Joint Systems**
Since the early 1960s The D.S. Brown Company has provided [expansion joint systems](https://www.dsbrown.com/product-category/bridges/expansion-joint-systems/) and structural bearing assemblies for bridges around the globe. Bridge expansion joint systems are directly exposed to vehicular wheel loads and, therefore, must resist dynamic forces causing fatigue and wear. In addition, these expansion joint systems must remain watertight to protect the bridge superstructure and substructure from corrosion.
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