Title T-Floor(reefer) fatique Test and welding parameters
Name Admin Date 2020-11-23
File
 Each Reefer factory's Al. T-floor joint shape of welding parts extruded / welding parameters as of Nov., 2020.

Since this welding is seriously important basically and technically for the strength of T-floor of Al. Reefer even if the Al. T-floor is being backed up by Al. stringers and PE stringers underneath this T-floor at the base assembly: owner inspector has to pay a special attention to check on the spot:

a) the scene of the fatigue testing on the welding bead of the Al. T-floor joining parts:





 
 The depth of fusion was only 2.16mm ( cracked )

  

 
b) Testing methods standardized for the fatique test:

 

 
 It keeps pressing 4mm downwards, then returning repeatedly all the time during the test till it is broken.

c) Comparison table of T-floor welding parameters made in each reefer factory group D / C / F / M:

 

Key technical points to be paid a special attention during inspection:

  Since the welding nozzle speed / current(AMP) is directly related to the fusion of joint welding bead ( penetration ); factory engineer / inspector have to monitor the welding parameters always.


  high output vs. working hrs. is to be poor quality high current is less fusion / strength.

 fast welding speed is to be shallow penetration. less frequency result is to be easy crack.

 

 
Note: factory with red wording remarks is very dangerous on the basis of actual test results..

 

d) The joint shapes of Al.T-floors in 4 groups factories:

CIMC Type





 The joint shape of QCRC/ TCRCs' T-floor (inserted type)     

 

d-1) Base assembly mechanism for CIMC:


 


 

 MCIQ's Al. T-floor's joint parts drawing(clip type with groove )




 

The joint of MCIQ’s T-floor (a groove on the top for better fusion)

d-2) Base assembly mechanism for MCIQ:





 DongFang Shape


The joint shape of DFQT’s Al. T-floor

d-3) Base assembly mechanism for DongFang:





 Fuwa Shape



 The joint shape of Fuwa's Al. T-floor

 d-4) Base assembly mechanism for Fuwa:



List