position of welding

[fazel1]

Is the definition of upward or downward which is given in ASME Sec IX only for 3G position or it is also for 5G & 6G position?

 

[metengr]

Are you asking about welder performance qualification for a particular process?

Review QW-405.3. This applies to upward and downward weld progression changes during vertical welding, if the progression is specified. Vertical does not mean limited to any particular coupon position.

 

[fazel1]

thank you metenger. in 5G position if we weld continuously , in half of the joint the weld is upward and in half of it the weld is downward. is my opinion correct?

 

[metengr]

Only if the welder does not understand uphill or downhill weld progression sequence because the pipe is not turned or rolled for the 5G position. Review QW-350 Welding Variables for Welders. If you intend to qualify a welder, it is best to qualify in an uphill progression because vertical-uphill progression qualifies for all other positions - see QW-405.2.

 

[fazel1]

but if we refer to QW-353 for SMAW or QW-356 for GTAW we can see that a change from uphill to downhill and vice versa is essential variable.

 

[metengr]

Unless you have a specific need for downhill welding, the welder(s) should qualify with uphill progression. For performance qualification, you must stick with either uphill or downhill progression for the entire coupon.