为什么go home,中间不加to,但welcome to my home却加to?

HOME 名词 n.
1.家,住家[C][U]
Now he has his home in Manchester.
他现在定居在曼彻斯特.
2.家庭,家庭生活[U][C]
He is planning to establish a home.
他正计划建立家庭.
3.(动植物的)生息地,产地;发源地[the S][(+of)]
New Orleans is the home of jazz.
新奥尔良是爵士音乐的发源地.
4.故乡;祖国[U]
I am now far from home.
我现在远离家了.
5.收容所;养育所;疗养所[C]
He spent his last years in a home for the aged.
他最后的几年是在养老院度过的.
6.【体】(赛跑等的)终点
7.【棒】本垒
副词 ad.
1.在家;回家;到家;回本国
The delegation will be home next week.
代表团将于下周回国.
2.中要害;深入地
He drove the nail home.
他把钉子敲到头.
形容词 a.[B]
1.家庭的
This is my home phone number.
这是我家的电话号码.
2.本国的,国内的;故乡的
These products are for home sale.
这些产品是供国内销售的.
3.总部的
Our home office is in New York.
我们的总部设在纽约.
4.(体育比赛等)在本地举行的;本地的
The home team won the game.
主队赢得了比赛.
home作副词讲所以不用介词to
welcome to my home 中home 作名词,所以要加