The phrase "a welcome affirmation" is correct and usable in written English.
It can be used when expressing approval or support for something that has been said or done, indicating that it is positively received.
Example: "The committee's decision to support the new initiative was a welcome affirmation of our efforts."
Alternatives: "a positive endorsement" or "a reassuring confirmation".
For Clinton, Obama's solicitousness is a welcome affirmation of his legacy and, perhaps, an opportunity to boost his wife's Presidential prospects.
At a time of shaken confidence, this show is more than a reminder of Mr. Hirschfeld's place in New York's cultural history: it is a welcome affirmation of its vitality as an arts and entertainment capital, and a tribute to the élan of those who continue to make it happen.
NEW YORK, 10 October 2014 – "In a year that has seen so many crises affecting children around the world, the Nobel Committee's decision is a welcome affirmation of the rights of every child to an education, to live free from violence, exploitation and abuse, and to be heard.
All that's been great, welcome affirmation that in our efforts to make a new kind of sports magazine, we've been onto something.
In a sympathetic response to the Pope's encyclical, Rowan Williams, the Archbishop of Canterbury, issued a statement saying: "I welcome the affirmation of the eucharist as a place of God's presence and action, and also welcome the Pope's reaffirmation of his 'burning desire' for common eucharistic celebration.
As someone who was reared Roman Catholic from the moment of birth, I have always known the Church and its community of believers to be a place of welcome and affirmation.
The good news is that these new rules are a huge affirmation of the subscription model, and will provide a welcome framework for investors and analysts.
This was a welcome development.
"I very much welcome this affirmation by Paulson and Steel that we need to regulate risk in ways that we haven't".
However, although we welcome the affirmation of the Beijing declaration and platform for action and its follow up reviews, and the recognition that the full implementation of these agreements is essential to achieving sustainable development, the International Planned Parenthood Federation is disappointed that the declaration did not go further in setting an ambitious agenda for the future".
