What is a tube simulator weld test?

A "simulator" test is for tube welders. The simulator simulates conditions encountered while welding water walls for a boiler. It consists of three pieces of tube with the test coupon in the center. This is a restrictive test. Restrictive means it is tight welding on each side. It is done in the 4G position, usually. A 6G simulator test would be very, very hard to accomplish successfully.

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olhand