With all due respect to DY, there is indeed a clause which includes the phrase "general welfare," and this phrase has indeed been controversial in understood meaning through the years. The social liberal interpretation is not what the Founding Fathers would have logically intended, and I will explain why. The "general welfare" as understood and articulated by a liberal, could conceivably encompass virtually anything and everything, without an exception, which contributed to the well-being of any individual. If this were what the FF intended, why enumerate specific powers to the Federal government, and indicate the remaining powers be delegated to the states and people? If the Federal government is responsible for everything, how can the states or people be responsible for anything? It directly contradicts logic, to presume "general welfare" was ever intended in such a broad sense. When virtually anything you can dream up, can be covered under the guise of "general welfare," this grants the Federal government universal power and control over everything, and limits the power of the individual or the state in anything. Therefore, there is no need for much of the rest of the Constitution. Since the rest of the Constitution exists, we must conclude, this was never what was meant by "general welfare" as written by the Founding Fathers.
First, we must evaluate the context. The Constitution establishes a very limited role of Federal government. Specifically enumerated powers are clearly established and outlined, and it is clearly stated, if the power is not exclusively enumerated to the Federal government, it belongs to the states and the people. This means, "general welfare" was intended to convey a meaning which is much less broad than the liberal interpretations.
The actual "clause" in question:
The Congress shall have Power To lay and collect Taxes, Duties, Imposts and Excises, to pay the Debts and provide for the common Defense and general Welfare of the United States.
Now let me ask you something... Where is my personal National Guard unit? I don't mean the NG unit of my local town, but my PERSONAL unit! Doesn't the Constitution say the government is supposed to provide me with "Defense?" Where are they? I need protecting when I go to the store, or on my way to work and stuff! I demand that I get my own personal National Guard unit! The Constitution guarantees that, doesn't it? Of course, you realize how absurd my suggestion is, and the same is true with regard to your demands for the government to provide you with personal welfare. It is simply not the responsibility of the Federal government to provide you with anything personally. The text reads: to provide for the common Defence and general Welfare of the United States. The Constitutional delegation of power to the Federal government, is to provide for the STATE you live in, not to YOU personally.