Welcome message is shown in the top right of the header that include the customer’s name when they logged in. However, if not login, by Magento 2 Default message, the welcome message is set to “Default welcome msg”. If you want to change the message, it is possible to do that. Remember that changing the “Default welcome msg” text as you desire to be more attracted and friendly before you launch your store.
Magento 2 configuration allows modifying the welcome message easily by following the guides:
Content. Then under
Headersection. Then, enter the
Welcome Textthat you want to appear.
Cache Managementlink at the top of the workspace. Then, follow the instructions to refresh the cache.
Ref: Magento 2 User Guide
It comes to the end of tutorial: How to Change Welcome Message in Magento 2.