Hose welding and testing Corrugated metal hose

 

hose assembly testing

dye penetrant

This test is to check for leaks in a fitting attachment weld.

 hydrostatic test

 In this test, the assembly is filled with water and internal pressure applied, a leak being detected by water dripping from any part of the assembly.

pneumatic test

 In this test, the assembly is filled with compressed air or gas and submerged in water, a leak being detected by air bubbles.  No leakage is permitted.

vacuum test

 In a vacuum test, all the air within an assembly is extracted and the assembly examined for distortion or failure. A leak is detected by monitoring if the pressure increases (i.e. from –40kPa to –30kPa) when the pump is isolated.

 

 

hose welding techniques

It must be remembered when commencing the welding operation of corrugated hoses that you are working with thin gauge materials down to 0.15mm thick. It is recommended that only experienced TIG welders attempt this operation. For braided hose, it is essential that every strand of wire in the braid is captured and secured in the welding process or premature failure will occur.