The use of 会 in 我们每次谈都会吵架
They are same.

我们每次谈都会吵架=We quarrel every time we talk
我们每次谈都吵架=We quarrel every time we talk


If you just want to say they are different you can see

我们每次谈都会吵架as every time we talk will lead to quarrel .

會has an emphasis mean.