What is the time period that an electrode can be kept at atmospheric temperature after electrodes are taking out from hermetically sealed containers or from baking or storage ovens?
As per AWS D1.1, Clause 5.3.2.2 and Table 5.1, approved atmospheric time periods are as per the below table.
After hermetically sealed containers are opened or after electrodes are removed from baking or storage ovens, the electrode exposure to the atmosphere shall not exceed the values shown below in column A.
After hermetically sealed containers are opened or after electrodes are removed from baking or storage ovens, the electrode exposure to the atmosphere shall not exceed the values shown below in column A.
Electrodes exposed to the atmosphere for periods less than those allowed by column A, in the above table may be returned to a holding oven maintained at 120 Deg C (min); after a minimum hold period of four hours at 129 deg C (min) the welding electrodes may be reissued.
The alternative exposure time values given in Column B in the above table may be used provided testing establishes the maximum allowable time.
Procedure for handling of electrodes having hermetically sealed containers.
Now a days electrodes are available in hermetically sealed containers. The main advantage of these electrode is that there is no need for baking of electrodes. It can be directly transferred to the portable oven at site.
Now a days electrodes are available in hermetically sealed containers. The main advantage of these electrode is that there is no need for baking of electrodes. It can be directly transferred to the portable oven at site.
Immediately after opening hermetically sealed container, electrodes shall be stored in ovens held at a temperature of at least 120 deg c.
If it is found that the hermetically sealed packet is teared, then the entire baking procedure is to be followed.
If it is found that the hermetically sealed packet is teared, then the entire baking procedure is to be followed.
Comments
Post a Comment