MATERIALS FOR DPT TESTING IN TRUSS discuss in this post. Dye Penetration Testing (DPT) is a test uses to identify the discontinuities in welding joints and connections. And uses to detect the cracks, fractures, pinholes, porosity, potholes.
This Dye Penetration Testing has different names,
- Liquid Penetrate Inspection ( LPI )
- Dye Penetrant Inspection ( DPI )
- Penetration Testing ( PT )
It is a simple test. And easy test to identify the discontinuities in welding joints. Using this DPT TEST ON TRUSS MEMBERS all the surface defects and flaws are easily identify and rectify. This test carries out without difficulties. This is one of the oldest test for identification of the defects in welding in truss joints and connections. There are certain STEPS FOR DPT TEST IN TRUSS for identification of defects.
MATERIALS FOR DPT TESTING IN TRUSS
The MATERIALS FOR DPT TESTING IN TRUSS are as follows,
The Cleaner, Penetrant and Developer are the three main materials for this DPT testing. These are all Non toxic chemicals. And Eco friendly materials. Using these Cleaner, Penetrant and Developer DPT testing carries out.
The Cleaner is uses to clean the surface of welding joints and connections of member. The specimen to test cleans for applying of the Penetrant in welding joints. It must be free from dirt, dust, paint, oil, grease and other foreign materials.
For this cleaning a organic chemical like acetone uses. It is a colourless and Non toxic chemical. And it is a portable material comes in spray cans and in tins.
The Penetrant is on of the main element in DPT testing. Penetrant is a Dye. Its a coloring agent. It is of a high contrast color. Penetrants are red in color. So that the indications seen clearly above the white developer. It is a water washable type. And easily cleans after testing on the materials. It sprays on the welding joints and other connections members.
It allows to remains for three to five minutes on the member. This makes to get the penetrant sink into the cracks, pores, etc. This depends on the size of the joints and connection to test.
The excess penetrant removes from the welding joints and other connections. And Developer applies on the welding joints and other connections of members.
The Developer is a thin layer of white in colour. The developer applies quickly on to the surface of area. And welding joints to examine on the member. This carries out with spraying. The complete area of penetrant covers with spraying the white Developer. This application of developer carries out within one to two minutes after drying of penetrant.
These are the three main materials for this DPT testing.